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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Hum. Dyn.</journal-id>
<journal-title>Frontiers in Human Dynamics</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Hum. Dyn.</abbrev-journal-title>
<issn pub-type="epub">2673-2726</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fhumd.2024.1203664</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Human Dynamics</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Exclusion and the growth of AI technology: a trade-theoretic analysis</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name><surname>Hazari</surname> <given-names>Bharat</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<uri xlink:href="https://loop.frontiersin.org/people/1376853/overview"/>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name><surname>Mohan</surname> <given-names>Vijay</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="corresp" rid="c001"><sup>&#x002A;</sup></xref>
<uri xlink:href="https://loop.frontiersin.org/people/1169596/overview"/>
</contrib>
</contrib-group>
<aff id="aff1"><sup>1</sup><institution>Lattice Analytics Pty Ltd</institution>, <addr-line>Melbourne, VIC</addr-line>, <country>Australia</country></aff>
<aff id="aff2"><sup>2</sup><institution>Blockchain Innovation Hub, RMIT University</institution>, <addr-line>Melbourne, VIC</addr-line>, <country>Australia</country></aff>
<author-notes>
<fn fn-type="edited-by" id="fn0012">
<p>Edited by: Arminda Guerra, University of Lisbon, Lisbon, Portugal</p>
</fn>
<fn fn-type="edited-by" id="fn0013">
<p>Reviewed by: Pramode Verma, University of Oklahoma, United States</p>
<p>Angela Cristina Marques Oliveira, Polytechnic Institute of Castelo Branco, Portugal</p>
</fn>
<corresp id="c001">&#x002A;Correspondence: Vijay Mohan, <email>vijay.mohan@outlook.com</email></corresp>
</author-notes>
<pub-date pub-type="epub">
<day>24</day>
<month>05</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="collection">
<year>2024</year>
</pub-date>
<volume>6</volume>
<elocation-id>1203664</elocation-id>
<history>
<date date-type="received">
<day>15</day>
<month>05</month>
<year>2023</year>
</date>
<date date-type="accepted">
<day>14</day>
<month>03</month>
<year>2024</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#x00A9; 2024 Hazari and Mohan.</copyright-statement>
<copyright-year>2024</copyright-year>
<copyright-holder>Hazari and Mohan</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<p>This study provides a four-good general equilibrium framework with international trade for assessing the impact of the advancement of automation and artificial intelligence (A&#x0026;AI) on the welfare of a group of agents who are excluded from both owning productive assets, such as capital and land, as well as consuming digital output (digital exclusion). We show that, depending on the magnitude of the factor intensities, the accumulation of A&#x0026;AI capital may negatively affect the income of the excluded group, who provide unskilled labor, or the owners of land. In doing so, we bring out the conflict of interests that may arise between the owners of A&#x0026;AI capital and other groups within society, which has implications for the pressure that exists to slow down the adoption of A&#x0026;AI in an economy.</p>
</abstract>
<kwd-group>
<kwd>automation</kwd>
<kwd>artificial intelligence</kwd>
<kwd>AK production function</kwd>
<kwd>digital exclusion</kwd>
<kwd>production exclusion</kwd>
</kwd-group>
<counts>
<fig-count count="2"/>
<table-count count="0"/>
<equation-count count="38"/>
<ref-count count="28"/>
<page-count count="10"/>
<word-count count="9896"/>
</counts>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Digital Impacts</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec sec-type="intro" id="sec1">
<label>1</label>
<title>Introduction</title>
<p>How will a rapid growth of automation and artificial intelligence (A&#x0026;AI) affect jobs, consumption, and welfare in the future? While this question has been a topic of research in economics for a while now, the recent introduction of artificial intelligence (AI) consumer technology on the internet has pushed AI firmly into public awareness. At the forefront of the propulsion of AI into the mainstream, as it were, was the launch of ChatGPT, a user-friendly chatbot, on November 30, 2022.<xref ref-type="fn" rid="fn0001"><sup>1</sup></xref> Barely 2&#x2009;months after its launch, ChatGPT boasted 100 million active users in January 2023, making it by far the fastest growing internet application in history.<xref ref-type="fn" rid="fn0002"><sup>2</sup></xref></p>
<p>AI is just one of the many new technologies that households and businesses are rapidly adopting in their various activities. Other developments such as blockchains, cryptocurrency, the metaverse, Web3, NFTs (non-fungible tokens), and DeFi (decentralized finance) are all very much a part of the lexicon now. On the one hand, AI and other technologies are transforming the business landscape as innovations are rapidly integrated into supply chains, management procedures, marketing, finance, and the development of new products; on the other hand, consumers are increasingly having to rapidly acclimatize themselves with the onslaught of new technology to make the most of the consumption possibilities that are now available.<xref ref-type="fn" rid="fn0003"><sup>3</sup></xref> The main focus of this study is to examine the impact of new technology on the welfare of groups that are excluded on both sides of the market&#x2014;they are excluded from owning factors of production and consuming certain goods (for reasons that we will elaborate on below).</p>
<p>To a large extent, the focus of past economic modeling on A&#x0026;AI has been on its disruption on production. Specifically, A&#x0026;AI primarily has a <italic>displacement effect</italic> as capital takes over tasks previously performed by labor (<xref ref-type="bibr" rid="ref6">Brynjolfsson and McAfee, 2014</xref>; <xref ref-type="bibr" rid="ref3">Aghion et al., 2017</xref>; <xref ref-type="bibr" rid="ref1">Acemoglu and Restrepo, 2018</xref>; <xref ref-type="bibr" rid="ref2">Acemoglu and Restrepo, 2019</xref>); on its own, the displacement effect causes a lower share of labor in national income. However, there are countervailing effects as well: first, a <italic>productivity effect</italic> arising from the cost reduction that A&#x0026;AI brings, which lowers the prices of goods and services, thereby increasing the demand for all goods and labor required to produce these goods; second, a <italic>capital accumulation effect</italic> induced by the rise in rental rates following the greater use of A&#x0026;AI techniques, which then raises the demand for labor; and third, an <italic>automation deepening effect</italic> that follows further improvements in A&#x0026;AI and enhances the productivity effect even more (<xref ref-type="bibr" rid="ref2">Acemoglu and Restrepo, 2019</xref>). Overall, the impact of technological advancement on employment depends on the relative magnitudes of these various effects, with demand playing an important role in the outcome (<xref ref-type="bibr" rid="ref5">Bessen, 2019</xref>).</p>
<p>While the role of demand has received some attention in the literature, it has been from the point of view of how an increase in demand following a price reduction results in an expansion of labor demand to counteract the displacement effect of A&#x0026;AI (<xref ref-type="bibr" rid="ref5">Bessen, 2019</xref>). This line of thinking is very much in the spirit of a representative consumer and presumes that all agents can consume all goods, depending on their preferences and budget constraints. However, there is another aspect of the demand-side that economists by and large ignore, but which sociologists and ethnographers recognize as being of primary importance in many contexts: some groups in society may be excluded from participating in certain economic activities, including the consumption of certain goods.<xref ref-type="fn" rid="fn0004"><sup>4</sup></xref> Specifically, there may exist <italic>digital exclusion</italic>, which we define as the inability of certain groups in society to use digital goods. The main contribution of this study is that it provides a framework to analyze how exclusion from the consumption of digital goods, in general, and AI, in particular, affects the welfare of the excluded groups. The standard neo-classical model assumes a representative consumer who characterizes aggregate consumption of goods and services in an economy. As such, the traditional neo-classical model cannot address consumption exclusion. Consequently, the standard model leads to a &#x201C;trickle-down&#x201D; outcome, where the gains from new technology and capital accumulation ultimately filter down to the lower socioeconomic groups. In the standard model with a representative agent, excluded groups&#x2019; income grows as the economy grows. The main thrust of this study is to show that this need not hold when exclusion is factored in.</p>
<p>Recent data collected by the International Telecommunication Union [<xref ref-type="bibr" rid="ref17">International Telecommunication Union (ITU), 2022</xref>, <xref ref-type="bibr" rid="ref18">2023</xref>] on digital access in 46 least developed countries (LDCs) with an aggregate population of approximately 1.13 billion suggest that only 36% (407 million) were using the internet, with the remaining (720 million) population still offline. Overall, 34% of the global population still remains without the internet. Even within the broad category of LDCs, disparities exist. At one end of the spectrum, the first tier of countries<xref ref-type="fn" rid="fn0005"><sup>5</sup></xref> has a relatively high penetration, with 60.8% of the population using the internet in 2022; at the other end, the lowest tier<xref ref-type="fn" rid="fn0006"><sup>6</sup></xref> has an internet penetration of 15% on average, with countries such as Burundi bringing up the rear with only 6% of the population using the internet. Furthermore, the inequality of internet access extends to other dimensions: in terms of gender, 43% of the male population in LDCs had access to internet in 2022, while only 30% of the female population used the internet; in terms of the urban&#x2013;rural divide, 52% of the urban population had internet access, with the number dropping to 28% for the rural population. Given that 64% of the LDC population remains offline, one may enquire why this is the case. Part of the problem is a coverage gap,<xref ref-type="fn" rid="fn0007"><sup>7</sup></xref> which accounts for 17% of the population being unable to access a broadband signal. Disconcertingly, 47% of the population in LDCs suffers from a usage gap.<xref ref-type="fn" rid="fn0008"><sup>8</sup></xref> An earlier report by <xref ref-type="bibr" rid="ref16">International Telecommunication Union (ITU) (2021)</xref> found that, while the cost of accessing the internet and purchasing a smartphone contributed to the low internet access rates, the main factor for the low usage was, by far, a lack of awareness of what the internet is. Moreover, even among those who were using the internet, many have only rudimentary digital skills [<xref ref-type="bibr" rid="ref16">International Telecommunication Union (ITU), 2021</xref>]. While 58% of the LDC population owned a phone, subscriptions to mobile broadband was still relatively low in 2022 (42 subscriptions per 100 individuals), suggesting that phones were still predominantly used for voice and text [<xref ref-type="bibr" rid="ref18">International Telecommunication Union (ITU), 2023</xref>]. More extensive digital use is also limited by the fact that, in 2019, only 8% of households in LDCs owned a computer and only 53% of the aggregate population had access to electricity [<xref ref-type="bibr" rid="ref16">International Telecommunication Union (ITU), 2021</xref>].</p>
<p>While the results are fairly stark for LDCs, many other developing countries in Asia and Africa have not tackled the problem of digital exclusion to any degree of satisfaction. In India, for example, <xref ref-type="bibr" rid="ref24">Oxfam (2022)</xref> reports (in a survey conducted between 2018 and 2020) that only 20% of the entire population had the ability to operate a computer or utilize the internet. Moreover, among the poorest 20% of the population, only 2.7% had access to a computer and 8.9% had access to the internet. Indeed, the report suggests that 70% of the population had poor or no connectivity to digital services. In spite of the major advancements in communication and connectivity over the past decade, lack of access to digital services remains a genuine problem in India and is worsened by the socioeconomic disparities that exist. To quote <xref ref-type="bibr" rid="ref24">Oxfam (2022)</xref>:</p>
<disp-quote>
<p><italic>&#x201C;There is evidence of a palpable digital divide between the rich and the poor, the urban areas and rural areas, men and women and among different caste and religious groups. This divide mirrors the existing socioeconomic inequalities&#x2014;it means that often the most marginalized groups have been the least digitalized whereas the privileged groups reap the benefits of digitalization.&#x201D;</italic></p>
</disp-quote>
<p>Unequal access to the internet is the first level of the digital divide (<xref ref-type="bibr" rid="ref23">Lutz, 2019</xref>), and LDCs (and other countries as well) certainly suffer from this inequality. The second level of the digital divide refers to inequalities in skills and uses (<xref ref-type="bibr" rid="ref10">Hargittai, 2002</xref>; <xref ref-type="bibr" rid="ref23">Lutz, 2019</xref>), and this essentially moves the focus away from access to usage. As pointed out earlier, <xref ref-type="bibr" rid="ref16">International Telecommunication Union (ITU) (2021)</xref> has substantial evidence of this sort of digital divide in LDCs: of the 64% of the population who do not use the internet, only 17% is accounted for the lack of access; the remainder is due to the inability or unwillingness to use the internet. Our own reference to consumption exclusion in this study relates to this second level of the digital divide, as excluded groups are unable to consume digital goods for reasons other than infrastructure constraints. As a separate issue, there may exist a third level of the digital divide which refers to unequal gains from the use of digital goods (<xref ref-type="bibr" rid="ref28">Van Deursen and Helsper, 2015</xref>; <xref ref-type="bibr" rid="ref23">Lutz, 2019</xref>).</p>
<p>Overall, a multitude of factors&#x2014;low education, poverty, poor infrastructure, gender divide, geographic divide, lack of access to credit, and social exclusion&#x2014;imply that a significant proportion of the global population remains excluded from the digital revolution that is currently taking place. The same factors that ensure certain sections of society are excluded from owning productive assets, such as capital and land, also result in exclusion from digital goods consumption.</p>
<p>When it comes to A&#x0026;AI, there is a growing concern about how the developing economies will fare. Technological advancement brings with it winners and losers. In a single economy, redistributive government policies may aid in generating more inclusive growth so that inequality is not exacerbated (<xref ref-type="bibr" rid="ref21">Korinek and Stiglitz, 2019</xref>; <xref ref-type="bibr" rid="ref20">Korinek et al., 2021</xref>). In a global scale, some countries will win the technological race and others will lose; in such a case, it will typically be harder for winners to compensate losers (<xref ref-type="bibr" rid="ref20">Korinek et al., 2021</xref>). The fact that A&#x0026;AI will transform international trade and development is no longer in dispute. The question that arises is how best these transformations can be managed, especially in a world where global trade is important. This necessitates developing trade models that incorporate A&#x0026;AI, a literature that is slowly expanding. <xref ref-type="bibr" rid="ref8">Goldfarb and Trefler (2019)</xref> put forward the case that trade models which incorporate economies of scale and scope may be useful in pinning thoughts on how A&#x0026;AI impact economies through trade. <xref ref-type="bibr" rid="ref4">Artuc et al. (2018)</xref> use the Ricardian model to study the impact of robot adoption on North&#x2013;South trade. As <xref ref-type="bibr" rid="ref20">Korinek et al. (2021)</xref> state:</p>
<disp-quote>
<p><italic>&#x201C;The new era will be governed by different rules and will require a different kind of economic analysis. Just as the production functions that Ricardo used to analyze agrarian and rural economies are very different from those in the models of a manufacturing economy that dominated the mid-20th century, current economic frameworks must be adjusted and updated to think about the models that will describe the next 50&#x2009;years.&#x201D;</italic></p>
</disp-quote>
<p>In this study, we attempt to tie all these disparate elements together. We construct a four-sector general equilibrium model that utilizes two types of capital (A&#x0026;AI capital and general-purpose capital), two types of labor (skilled and unskilled), and land as factors of production. There are three main elements of the model:</p>
<list list-type="simple">
<list-item><p>(a) A&#x0026;AI is fairly advanced so that it is simply a technique of production that competes with traditional techniques utilizing standard (non-intelligent) capital, which we label general-purpose capital, and labor.</p></list-item>
<list-item><p>(b) There is international trade so that two of the four goods are traded, while the other two are non-traded.</p></list-item>
<list-item><p>(c) There exists a group of agents (unskilled labor) who are excluded from both owning productive assets (capital and land) and consuming digital output.</p></list-item>
</list>
<p>To capture, (a) we use the production function suggested by <xref ref-type="bibr" rid="ref19">Jones and Manuelli (1990)</xref> to generate endogenous growth, which has subsequently been adapted by <xref ref-type="bibr" rid="ref11">Hazari et al. (2022)</xref> to model A&#x0026;AI. When utilizing labor, <inline-formula>
<mml:math id="M1">
<mml:mi>L</mml:mi>
</mml:math>
</inline-formula>, and capital, <inline-formula>
<mml:math id="M2">
<mml:mi>K</mml:mi>
</mml:math>
</inline-formula>, as inputs, this production function is <inline-formula>
<mml:math id="M3">
<mml:mrow>
<mml:mi>X</mml:mi>
<mml:mi mathvariant="normal">&#x2009;</mml:mi>
<mml:mo>=</mml:mo>
<mml:mi mathvariant="normal">&#x2009;</mml:mi>
<mml:mi>A</mml:mi>
<mml:mi>K</mml:mi>
<mml:mi mathvariant="normal">&#x2009;</mml:mi>
<mml:mo>+</mml:mo>
<mml:mi mathvariant="normal">&#x2009;</mml:mi>
<mml:mi>F</mml:mi>
<mml:mo stretchy="false">(</mml:mo>
<mml:mi>L</mml:mi>
<mml:mo>,</mml:mo>
<mml:mi mathvariant="normal">&#x2009;</mml:mi>
<mml:mi>K</mml:mi>
<mml:mo stretchy="false">)</mml:mo>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula>where <inline-formula>
<mml:math id="M4">
<mml:mi>X</mml:mi>
</mml:math>
</inline-formula> is the maximum output from a specific combination of the two factors. The reason why the Jones&#x2013;Manuelli function is particularly attractive for modeling A&#x0026;AI is that one component of the production function (the <inline-formula>
<mml:math id="M5">
<mml:mrow>
<mml:mi>A</mml:mi>
<mml:mi>K</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> part) represents a technique that utilizes only capital, which is required for automation. The second component, <inline-formula>
<mml:math id="M6">
<mml:mrow>
<mml:mi>F</mml:mi>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:mi>L</mml:mi>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:mi>K</mml:mi>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula> represents a technique of production that uses both capital and labor. The additive nature of the function then implies that these techniques are substitutes. To give the example provided in the study by <xref ref-type="bibr" rid="ref11">Hazari et al. (2022)</xref>, consider a taxi service (in the future) that has two techniques for servicing fares: using driverless cabs piloted by AI agents and the more traditional technique involving a car and driver. The two are substitutes for the purpose of providing fares and which technique is employed, and to what extent, depends on numerous factors such as the costs of inputs and the productivity of factors. Therefore, the Jones&#x2013;Manuelli production is a versatile way of modeling A&#x0026;AI without losing the possibility that it exists side-by-side with traditional techniques of production.</p>
<p><xref ref-type="bibr" rid="ref11">Hazari et al. (2022)</xref> consider a version of this function that has two types of capital, A&#x0026;AI capital (<inline-formula>
<mml:math id="M7">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>) and general-purpose capital (<inline-formula>
<mml:math id="M8">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>), which result in a production function of the form <inline-formula>
<mml:math id="M9">
<mml:mrow>
<mml:mi>X</mml:mi>
<mml:mo>=</mml:mo>
<mml:mi>A</mml:mi>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:mi>F</mml:mi>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:mi>L</mml:mi>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</inline-formula>. Here, <inline-formula>
<mml:math id="M10">
<mml:mrow>
<mml:mi>A</mml:mi>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> represents the contribution to output by A&#x0026;AI capital that requires no complementary labor for production activities, while <inline-formula>
<mml:math id="M11">
<mml:mrow>
<mml:mi>F</mml:mi>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:mi>L</mml:mi>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</inline-formula> captures the traditional technique of production that utilizes both labor and capital to produce output. Inherent in this formulation is the presumption that these capital stocks are exogenous. In our model, the JM function is used in one sector, which we label the &#x201C;high-tech&#x201D; sector and that we interpret as a composite digital good. This sector then not only uses A&#x0026;AI for production but also produces the digital good that some agents in the economy are excluded from consuming. The other consuming in the model have traditional neo-classical production functions. Sectors 1 and 2 are traded goods, while sectors 3 and 4 (that use land and unskilled labor as factors) are non-traded goods. As outlined in (c) above, unskilled labor is the excluded group in our model: they do not own any productive asset apart from their labor (so they experience production exclusion) and are not able to consume the output of sector 1 (digital consumption exclusion).</p>
<p>Based on this modeling structure, we then examine the outcomes when A&#x0026;AI becomes more prevalent, which essentially translates to an accumulation of <inline-formula>
<mml:math id="M12">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. Our comparative static results show that, while owners of capital always gain a higher income from this change, depending on factor intensities in the non-traded sectors either the unskilled labor or the owners of land experience a fall in income. This has interesting political economy implications. If the income accruing to unskilled labor falls, the excluded group becomes worse-off. This may generate dissatisfaction with the growth of AI, leading to greater inequality between excluded and non-excluded sections of society, and thereby resulting in calls for policy intervention to reduce inequality. On the other hand, if the income of land-owners falls (and the income of excluded group rises), the opposition to the A&#x0026;AI is not based on the rising inequality in the economy; rather, it arises from land owners, who are typically powerful and politically influential in developing economies, trying to preserve their income and lobbying policymakers for this purpose.</p>
<p>Our results provide theoretical underpinnings to the link between a digital divide and widening inequality. A report by the <xref ref-type="bibr" rid="ref29">World Bank (2016)</xref>, for example, suggests that inadequate access to digital technologies results in widening income inequality; specifically, based on labor market evidence, the report states that:</p>
<disp-quote>
<p><italic>&#x201C;Digital technologies can improve overall welfare and reduce poverty, but without complementary investments, they can also worsen inequality&#x201D;</italic> (p. 100) &#x2026; <italic>&#x201C;Perhaps the biggest risk from technological change, however, is that of widening income inequality. Although technologies are becoming widespread, the economic payoffs are not. The poor almost exclusively use only mobile phones not connected to the internet. And even if they had access to the internet, they lack the skills to use it productively, with many still unable to read in the first place. Positive impacts from using digital technologies&#x2014;as with other technologies in the past century&#x2014;are most likely to be captured by those already better off.&#x201D;</italic> (p. 118).</p>
</disp-quote>
<p>Indeed, the impact of digital exclusion on inequality only seems to have widened after the COVID-19 pandemic (<xref ref-type="bibr" rid="ref15">International Monetary Fund, 2020</xref>).</p>
<p>Overall, the empirical earlier in this section indicates that there exists digital exclusion in a significant portion of the global population, which occurs due to a number of factors including structural inequality in access to digital technologies. The growth of digital technology, automation, and AI then has the potential impact of widening income inequality, which then increases digital exclusion. The consequence is a vicious cycle of widening digital exclusion and income inequality that feed off each other. One of the main contributions of this study is to recognize that such a vicious cycle exists and to provide a theoretical framework to organize thoughts for policymaking in this area.</p>
<p>The study is organized as follows: Section 2 specifies the model, while Section 3 presents the main results. Finally, Section 4 provides concluding comments.</p>
</sec>
<sec id="sec2">
<label>2</label>
<title>A model of AI with exclusion</title>
<p>In this section, we present a four-good (or four-sector) trade-theoretic model for the purpose of analyzing the impact of automation and AI technology expansion (through the accumulation of A&#x0026;AI capital) on the welfare of various groups in society. Overall, our modeling choices rest on a number of stylized aspects of the economic problem we would like to capture. First, to reiterate the main point of this study, we develop the model in a manner that the restriction to participate in the A&#x0026;AI revolution occurs not only from the production side but also from the demand side, with some agents being excluded from consuming the output produced by A&#x0026;AI capital. Thus, some unfortunate section of society faces a double-whammy of exclusion: access to both ownership of capital and land and the consumption of AI capital is out of reach for this group. In a manner similar to Kaldorian and Marxian models, this requires moving away from two traditional neo-classical assumptions: the existence of a representative agent that characterizes aggregate consumption, and the universal ownership of factors of production. In this study, we drop both of these assumptions. Second, we require a fairly versatile framework that has multiple types of labor, as some types of labor suffer from exclusion, whereas others do not. We also need multiple types of capital as some of the capital are automated while others are not automated. Third, in developing economies where exclusion is prevalent, which is very much the focus of this study, land-owners form a powerful political lobby, and agrarian incomes are an important part of national income. Our model, therefore, incorporates this group of agents by introducing land as a separate factor of production. Fourth, since trade is important for developing economies, we allow for some sectors to participate in trade, while other sectors (such as domestic household work) do not participate in trade. This necessitates multiple sectors in the economy, and we introduce four sectors in our model, which are needed to incorporate the myriad elements outlined above and ensure the existence of a concrete equilibrium for the economy. Finally, our framework assigns certain factors to different sectors. We emphasize, however, that this assignment is not unique; rather, depending on the context, one can move factors around in the model equations in different ways.</p>
<p>There are four goods produced in the domestic economy: <inline-formula>
<mml:math id="M13">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mo>,</mml:mo>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mo>,</mml:mo>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M14">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. These goods are produced using the following resources:</p>
<list list-type="simple">
<list-item><p>(a) Two types of capital: mobile general-purpose capital (<inline-formula>
<mml:math id="M15">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>) and sector-specific A&#x0026;AI capital (<inline-formula>
<mml:math id="M16">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>).</p></list-item>
<list-item><p>(b) Two types of labor: skilled labor (<inline-formula>
<mml:math id="M17">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>) and unskilled labor (<inline-formula>
<mml:math id="M18">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>).</p></list-item>
<list-item><p>(c) Land (<inline-formula>
<mml:math id="M19">
<mml:mi>T</mml:mi>
</mml:math>
</inline-formula>).</p></list-item>
</list>
<p>In what follows, we use the subscripts <inline-formula>
<mml:math id="M20">
<mml:mrow>
<mml:mi>i</mml:mi>
<mml:mo>,</mml:mo>
<mml:mi>g</mml:mi>
<mml:mo>,</mml:mo>
<mml:mi>s</mml:mi>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M21">
<mml:mi>u</mml:mi>
</mml:math>
</inline-formula> as short-hand notation for referring to <inline-formula>
<mml:math id="M22">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>,</mml:mo>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
<mml:mo>,</mml:mo>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M23">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula> respectively. We differentiate between traded goods (<inline-formula>
<mml:math id="M24">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M25">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>) and non-traded goods (<inline-formula>
<mml:math id="M26">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M27">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>). This yields a block structure for the model, which we describe in detail below.</p>
<p>We assume that good 1 represents a &#x2018;high-tech&#x2019; industry, which is produced using a Jones&#x2013;Manuelli (JM) production function. As outlined in Section 1, the JM production function is particularly conducive for modeling A&#x0026;AI. Specifically, <inline-formula>
<mml:math id="M28">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> can be produced either using automated A&#x0026;AI capital, <inline-formula>
<mml:math id="M29">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula> or utilizing the more traditional techniques that combine general-purpose capital, <inline-formula>
<mml:math id="M30">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, and skilled labor, <inline-formula>
<mml:math id="M31">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. While <inline-formula>
<mml:math id="M32">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> could represent a number of manufacturing industries, as outlined in the introduction, for our purpose, we can think of <inline-formula>
<mml:math id="M33">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> as a composite digital sector that comprises computers, sophisticated software and virtual applications that are at the forefront of the digital revolution, including AI applications for consumers.<xref ref-type="fn" rid="fn0009"><sup>9</sup></xref> The JM production function for <inline-formula>
<mml:math id="M34">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is:</p>
<disp-formula id="EQ1">
<label>(1)</label>
<mml:math id="M35">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mi>A</mml:mi>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mrow>
<mml:mi>i</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>F</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mrow>
<mml:mi>s</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>=</mml:mo>
<mml:mi>A</mml:mi>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mrow>
<mml:mi>i</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mrow>
<mml:mi>s</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>f</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>k</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</disp-formula>
<p>The variable <inline-formula>
<mml:math id="M36">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mrow>
<mml:mi>i</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> represents the amount of A&#x0026;AI capital used in Sector 1; other variables have similar interpretations of their subscripts. The fact that <inline-formula>
<mml:math id="M37">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> allows for A&#x0026;AI production techniques is essentially why this corresponds to the technology-intensive sector in our model; consequently, we assume that <inline-formula>
<mml:math id="M38">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is a specific factor which is used only in Sector 1. General-purpose capital, on the other hand, is assumed to be mobile between Sectors 1 and 2. The function <inline-formula>
<mml:math id="M39">
<mml:mrow>
<mml:msub>
<mml:mi>F</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is a standard neo-classical production function. The variable <inline-formula>
<mml:math id="M40">
<mml:mrow>
<mml:msub>
<mml:mi>k</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> represents the general-purpose capital to skilled labor ratio in Sector 1, that is, <inline-formula>
<mml:math id="M41">
<mml:mrow>
<mml:msub>
<mml:mi>k</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mfrac>
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mrow>
<mml:mi>s</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:mfrac>
</mml:mrow>
</mml:math>
</inline-formula>. The parameter <inline-formula>
<mml:math id="M42">
<mml:mi>A</mml:mi>
</mml:math>
</inline-formula> is a measure of the productivity of A&#x0026;AI capital. Let good 1 be the numeraire. It then follows that the rate of return, <inline-formula>
<mml:math id="M43">
<mml:mrow>
<mml:mi>R</mml:mi>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula> accruing to <inline-formula>
<mml:math id="M44">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> equals:</p>
<disp-formula id="EQ2">
<label>(2)</label>
<mml:math id="M45">
<mml:mrow>
<mml:mi>R</mml:mi>
<mml:mo>=</mml:mo>
<mml:mi>A</mml:mi>
</mml:mrow>
</mml:math>
</disp-formula>
<p>Thus, the return to the specific capital is a constant equaling the parameter <inline-formula>
<mml:math id="M46">
<mml:mi>A</mml:mi>
</mml:math>
</inline-formula>.</p>
<p>Now consider the production of <inline-formula>
<mml:math id="M47">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. We assume that <inline-formula>
<mml:math id="M48">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is good that is produced without A&#x0026;AI capital; that is, the manufacture of <inline-formula>
<mml:math id="M49">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> requires the mobile general-purpose capital, <inline-formula>
<mml:math id="M50">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, and skilled labor, <inline-formula>
<mml:math id="M51">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, as shown below:</p>
<disp-formula id="EQ3">
<label>(3)</label>
<mml:math id="M52">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>F</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mrow>
<mml:mi>s</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mrow>
<mml:mi>s</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>f</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>k</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>.</mml:mo>
</mml:mrow>
</mml:math>
</disp-formula>
<p>The production function for commodity <inline-formula>
<mml:math id="M53">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is neo-classical. This represents an industry that requires a significant input of skilled workers who cannot be easily substituted by A&#x0026;AI capital. To fix ideas, we suppose that good 2 is an exportable service, such as cultural and recreational services (movies and songs, for example), which requires human input that cannot easily be replaced by AI.</p>
<p>Both goods 1 and 2 are assumed to be traded; without loss of generality, we assume that <inline-formula>
<mml:math id="M54">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is imported and <inline-formula>
<mml:math id="M55">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is exported. Furthermore, we suppose that the domestic economy is a small country, which implies that the term of trade, <inline-formula>
<mml:math id="M56">
<mml:mi>P</mml:mi>
</mml:math>
</inline-formula>, is exogenously given. The variables <inline-formula>
<mml:math id="M57">
<mml:mi>r</mml:mi>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M58">
<mml:mrow>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> denote the return to <inline-formula>
<mml:math id="M59">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M60">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, respectively. Assuming profit maximization and the existence of an interior solution, it follows that:</p>
<disp-formula id="EQ4">
<label>(4)</label>
<mml:math id="M61">
<mml:mrow>
<mml:mi>r</mml:mi>
<mml:mo>=</mml:mo>
<mml:msubsup>
<mml:mi>f</mml:mi>
<mml:mn>1</mml:mn>
<mml:mo>&#x2032;</mml:mo>
</mml:msubsup>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>k</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>=</mml:mo>
<mml:mi>P</mml:mi>
<mml:msubsup>
<mml:mi>f</mml:mi>
<mml:mn>2</mml:mn>
<mml:mo>&#x2032;</mml:mo>
</mml:msubsup>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>k</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ5">
<label>(5)</label>
<mml:math id="M62">
<mml:mrow>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>f</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>k</mml:mi>
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mi>s</mml:mi>
</mml:mrow>
</mml:msub>
<mml:msubsup>
<mml:mi>f</mml:mi>
<mml:mn>1</mml:mn>
<mml:mo>&#x2032;</mml:mo>
</mml:msubsup>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>=</mml:mo>
<mml:mi>P</mml:mi>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>f</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>k</mml:mi>
<mml:mrow>
<mml:mn>2</mml:mn>
<mml:mi>s</mml:mi>
</mml:mrow>
</mml:msub>
<mml:msubsup>
<mml:mi>f</mml:mi>
<mml:mn>2</mml:mn>
<mml:mo>&#x2032;</mml:mo>
</mml:msubsup>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</disp-formula>
<p>Sectors 1 and 2 represent the first &#x201C;block&#x201D; in our model in the sense that they share the mobile factors of production <inline-formula>
<mml:math id="M63">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
<mml:mspace width="thickmathspace"/>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M64">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>; more precisely, this is the &#x201C;traded block&#x201D; given that these two goods can be exported and imported.</p>
<p>The second block in this model is the non-traded block, which comprises goods <inline-formula>
<mml:math id="M65">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M66">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. These two goods are produced with the help of land and unskilled labor using neo-classical production functions:</p>
<disp-formula id="EQ6">
<label>(6)</label>
<mml:math id="M67">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>F</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mrow>
<mml:mi>u</mml:mi>
<mml:mn>3</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msub>
<mml:mi>T</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mrow>
<mml:mi>u</mml:mi>
<mml:mn>3</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>f</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ7">
<label>(7)</label>
<mml:math id="M68">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>F</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mrow>
<mml:mi>u</mml:mi>
<mml:mn>4</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msub>
<mml:mi>T</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:msub>
<mml:mi>f</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</disp-formula>
<p>where <inline-formula>
<mml:math id="M69">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mrow>
<mml:mi>u</mml:mi>
<mml:mi>n</mml:mi>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M70">
<mml:mrow>
<mml:msub>
<mml:mi>T</mml:mi>
<mml:mi>n</mml:mi>
</mml:msub>
<mml:mspace width="thickmathspace"/>
<mml:mo stretchy="false">(</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula>for <inline-formula>
<mml:math id="M71">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mo>&#x2208;</mml:mo>
<mml:mrow>
<mml:mo>{</mml:mo>
<mml:mrow>
<mml:mn>3</mml:mn>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:mn>4</mml:mn>
</mml:mrow>
<mml:mo>}</mml:mo>
</mml:mrow>
<mml:mo stretchy="false">)</mml:mo>
<mml:mspace width="thickmathspace"/>
</mml:mrow>
</mml:math>
</inline-formula> represent the allocation of unskilled labor and land to sectors 3 and 4, respectively. The variables <inline-formula>
<mml:math id="M72">
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mspace width="thickmathspace"/>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M73">
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> represent the land to unskilled labor intensities in these sectors. Typical examples of non-traded goods include household and personal services but can be generalized to include items such as agricultural products that are subjected to high transport costs or trade barriers that render them non-traded for practical purposes.</p>
<p>It is assumed without loss of any generality that good 3 serves as a numeraire for the non-traded block, so <inline-formula>
<mml:math id="M74">
<mml:mrow>
<mml:msub>
<mml:mi>P</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula>. Then, <inline-formula>
<mml:math id="M75">
<mml:mrow>
<mml:msub>
<mml:mi>P</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> provides the relative price of good 4, which guides production and consumption in this block. Letting <inline-formula>
<mml:math id="M76">
<mml:mrow>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> represent the wage of unskilled labor and <inline-formula>
<mml:math id="M77">
<mml:mi>&#x03C0;</mml:mi>
</mml:math>
</inline-formula> denote the rental on land, the factor price equations for these sectors are given below (based on the assumption of profit maximization and an interior solution):</p>
<disp-formula id="EQ8">
<label>(8)</label>
<mml:math id="M78">
<mml:mrow>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mrow>
<mml:mo>[</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>f</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:msubsup>
<mml:mi>f</mml:mi>
<mml:mn>3</mml:mn>
<mml:mo>&#x2032;</mml:mo>
</mml:msubsup>
</mml:mrow>
<mml:mo>]</mml:mo>
</mml:mrow>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>P</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>f</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msubsup>
<mml:mi>t</mml:mi>
<mml:mn>4</mml:mn>
<mml:mo>&#x2032;</mml:mo>
</mml:msubsup>
<mml:msubsup>
<mml:mi>f</mml:mi>
<mml:mn>4</mml:mn>
<mml:mo>&#x2032;</mml:mo>
</mml:msubsup>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ9">
<label>(9)</label>
<mml:math id="M79">
<mml:mrow>
<mml:mi>&#x03C0;</mml:mi>
<mml:mo>=</mml:mo>
<mml:msubsup>
<mml:mi>f</mml:mi>
<mml:mn>3</mml:mn>
<mml:mo>&#x2032;</mml:mo>
</mml:msubsup>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>P</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:msubsup>
<mml:mi>f</mml:mi>
<mml:mn>4</mml:mn>
<mml:mo>&#x2032;</mml:mo>
</mml:msubsup>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</disp-formula>
<p>Essentially, <xref rid="EQ2" ref-type="disp-formula">equations (2)</xref>, <xref rid="EQ4" ref-type="disp-formula">(4)</xref>, <xref rid="EQ5" ref-type="disp-formula">(5)</xref>, <xref rid="EQ8" ref-type="disp-formula">(8)</xref> and <xref rid="EQ9" ref-type="disp-formula">(9)</xref> capture the pricing side of the model, while <xref rid="EQ3" ref-type="disp-formula">equations (3)</xref>, <xref rid="EQ6" ref-type="disp-formula">(6)</xref> and <xref rid="EQ7" ref-type="disp-formula">(7)</xref> capture the production side.</p>
<p>The price equations can also be written using variable unit input coefficients, <inline-formula>
<mml:math id="M80">
<mml:mrow>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>m</mml:mi>
<mml:mi>n</mml:mi>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> (where <inline-formula>
<mml:math id="M81">
<mml:mrow>
<mml:mi>m</mml:mi>
<mml:mo>&#x2208;</mml:mo>
<mml:mrow>
<mml:mo>{</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:mi>T</mml:mi>
</mml:mrow>
<mml:mo>}</mml:mo>
</mml:mrow>
<mml:mspace width="thickmathspace"/>
</mml:mrow>
</mml:math>
</inline-formula>and <inline-formula>
<mml:math id="M82">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mo>&#x2208;</mml:mo>
<mml:mrow>
<mml:mo>{</mml:mo>
<mml:mrow>
<mml:mn>1</mml:mn>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:mn>2</mml:mn>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:mn>3</mml:mn>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:mn>4</mml:mn>
</mml:mrow>
<mml:mo>}</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</inline-formula>), in the usual manner as shown below:</p>
<disp-formula id="EQ10">
<label>(10)</label>
<mml:math id="M83">
<mml:mrow>
<mml:mi>R</mml:mi>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>i</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:mi>r</mml:mi>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>s</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ11">
<label>(11)</label>
<mml:math id="M84">
<mml:mrow>
<mml:mi>r</mml:mi>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>s</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mi>P</mml:mi>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ12">
<label>(12)</label>
<mml:math id="M85">
<mml:mrow>
<mml:mi>&#x03C0;</mml:mi>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>T</mml:mi>
<mml:mn>3</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>u</mml:mi>
<mml:mn>3</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ13">
<label>(13)</label>
<mml:math id="M86">
<mml:mrow>
<mml:mi>&#x03C0;</mml:mi>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>T</mml:mi>
<mml:mn>4</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>u</mml:mi>
<mml:mn>4</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>P</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<p>It is worth noting that there are two blocks in the price equations as well: the traded block is given by <xref ref-type="disp-formula" rid="EQ11">equations (10)</xref> and <xref ref-type="disp-formula" rid="EQ12">(11)</xref>, and the non-traded block is given by <xref ref-type="disp-formula" rid="EQ13">equations (12)</xref> and <xref ref-type="disp-formula" rid="EQ13">(13)</xref>.</p>
<p>Before introducing the demand-side of this model, we illustrate diagrammatically the structure of the supply-side outlined above. Let us begin with the traded block first, which is shown in <xref ref-type="fig" rid="fig1">Figures 1</xref>, <xref ref-type="fig" rid="fig2">2</xref>. <xref ref-type="fig" rid="fig1">Figure 1</xref> shows the extended Edgeworth box diagram.</p>
<fig position="float" id="fig1">
<label>Figure 1</label>
<caption>
<p>The Edgeworth box for the traded block.</p>
</caption>
<graphic xlink:href="fhumd-06-1203664-g001.tif"/>
</fig>
<fig position="float" id="fig2">
<label>Figure 2</label>
<caption>
<p>Production possibilities in the traded block.</p>
</caption>
<graphic xlink:href="fhumd-06-1203664-g002.tif"/>
</fig>
<p>We know that part of <inline-formula>
<mml:math id="M87">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is produced by the specific factor <inline-formula>
<mml:math id="M88">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. This is shown by <inline-formula>
<mml:math id="M89">
<mml:mrow>
<mml:msub>
<mml:mover accent="true">
<mml:mi>X</mml:mi>
<mml:mo>&#x02DC;</mml:mo>
</mml:mover>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mi>A</mml:mi>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> on the vertical axis. From this, we draw the Edgeworth box with factors <inline-formula>
<mml:math id="M90">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
<mml:mspace width="thickmathspace"/>
</mml:mrow>
</mml:math>
</inline-formula>and <inline-formula>
<mml:math id="M91">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> used in the traded block to produce <inline-formula>
<mml:math id="M92">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M93">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. The isoquants for <inline-formula>
<mml:math id="M94">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M95">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>measured from the origin points <inline-formula>
<mml:math id="M96">
<mml:mrow>
<mml:msub>
<mml:mi>O</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M97">
<mml:mrow>
<mml:msub>
<mml:mi>O</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, respectively. In drawing <xref ref-type="fig" rid="fig1">Figure 1</xref>, we have assumed that <inline-formula>
<mml:math id="M98">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is more capital intensive than <inline-formula>
<mml:math id="M99">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. Given the terms of trade, <inline-formula>
<mml:math id="M100">
<mml:mi>P</mml:mi>
</mml:math>
</inline-formula>, which determines the wage-rental ratio, production equilibrium occurs at the pint of tangency to the isoquants <inline-formula>
<mml:math id="M101">
<mml:mrow>
<mml:msub>
<mml:mi>x</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:msub>
<mml:mi>x</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M102">
<mml:mrow>
<mml:msub>
<mml:mi>x</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:msub>
<mml:mi>x</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>.</p>
<p>In <xref ref-type="fig" rid="fig2">Figure 2</xref>, this is transferred to the output space. The output produced by the stock of A&#x0026;AI capital utilized in Sector 1 is shown by the distance <inline-formula>
<mml:math id="M103">
<mml:mrow>
<mml:mi>O</mml:mi>
<mml:msub>
<mml:mover accent="true">
<mml:mi>X</mml:mi>
<mml:mo>&#x02DC;</mml:mo>
</mml:mover>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> in <xref ref-type="fig" rid="fig2">Figure 2</xref>, which corresponds to the distance <inline-formula>
<mml:math id="M104">
<mml:mrow>
<mml:mi>O</mml:mi>
<mml:msub>
<mml:mover accent="true">
<mml:mi>X</mml:mi>
<mml:mo>&#x02DC;</mml:mo>
</mml:mover>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> in <xref ref-type="fig" rid="fig1">Figure 1</xref>. This amount of <inline-formula>
<mml:math id="M105">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is independent of commodity and factor prices. Now, starting at <inline-formula>
<mml:math id="M106">
<mml:mrow>
<mml:msub>
<mml:mover accent="true">
<mml:mi>X</mml:mi>
<mml:mo>&#x02DC;</mml:mo>
</mml:mover>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> in <xref ref-type="fig" rid="fig2">Figure 2</xref>, if all endowments of <inline-formula>
<mml:math id="M107">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M108">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> are used in the manufacture of <inline-formula>
<mml:math id="M109">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, the total quantity of good 1 that can be produced in the economy is represented by <inline-formula>
<mml:math id="M110">
<mml:mi>T</mml:mi>
</mml:math>
</inline-formula> in <xref ref-type="fig" rid="fig2">Figure 2</xref>, with the distance <inline-formula>
<mml:math id="M111">
<mml:mrow>
<mml:msub>
<mml:mover accent="true">
<mml:mi>X</mml:mi>
<mml:mo>&#x02DC;</mml:mo>
</mml:mover>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mi>T</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> representing the output produced by <inline-formula>
<mml:math id="M112">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M113">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. It is evident that point <inline-formula>
<mml:math id="M114">
<mml:mi>T</mml:mi>
</mml:math>
</inline-formula> corresponds to <inline-formula>
<mml:math id="M115">
<mml:mrow>
<mml:msub>
<mml:mi>O</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> in <xref ref-type="fig" rid="fig1">Figure 1</xref>. As the mobile factors <inline-formula>
<mml:math id="M116">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M117">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> are moved to Sector 2, we get the familiar bowed production possibility curve (PPC) shown by the arc <inline-formula>
<mml:math id="M118">
<mml:mrow>
<mml:mi>T</mml:mi>
<mml:msup>
<mml:mi>T</mml:mi>
<mml:mo>&#x2032;</mml:mo>
</mml:msup>
</mml:mrow>
</mml:math>
</inline-formula>. At <inline-formula>
<mml:math id="M119">
<mml:msup>
<mml:mi>T</mml:mi>
<mml:mo>&#x2032;</mml:mo>
</mml:msup>
</mml:math>
</inline-formula>, which corresponds to point <inline-formula>
<mml:math id="M120">
<mml:mrow>
<mml:msub>
<mml:mi>O</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> in <xref ref-type="fig" rid="fig1">Figure 1</xref>, all available <inline-formula>
<mml:math id="M121">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M122">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> have been allocated to the production of <inline-formula>
<mml:math id="M123">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>; this maximum level of <inline-formula>
<mml:math id="M124">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is shown by <inline-formula>
<mml:math id="M125">
<mml:mrow>
<mml:msubsup>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
<mml:mrow>
<mml:mi>max</mml:mi>
</mml:mrow>
</mml:msubsup>
</mml:mrow>
</mml:math>
</inline-formula> on the horizontal axis. At this level of <inline-formula>
<mml:math id="M126">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, the economy continues to produce <inline-formula>
<mml:math id="M127">
<mml:mrow>
<mml:msub>
<mml:mover accent="true">
<mml:mi>X</mml:mi>
<mml:mo>&#x02DC;</mml:mo>
</mml:mover>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> units of good 1 through utilizing A&#x0026;AI capital alone. The overall production possibilities of the economy are shown by <inline-formula>
<mml:math id="M128">
<mml:mrow>
<mml:mi>T</mml:mi>
<mml:msup>
<mml:mi>T</mml:mi>
<mml:mo>&#x2032;</mml:mo>
</mml:msup>
<mml:msubsup>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
<mml:mrow>
<mml:mi>max</mml:mi>
</mml:mrow>
</mml:msubsup>
</mml:mrow>
</mml:math>
</inline-formula>. However, if all available <inline-formula>
<mml:math id="M129">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M130">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> are used for the production of <inline-formula>
<mml:math id="M131">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, all the action will take place at the point <inline-formula>
<mml:math id="M132">
<mml:msup>
<mml:mi>T</mml:mi>
<mml:mo>&#x2032;</mml:mo>
</mml:msup>
</mml:math>
</inline-formula>, which lies at the corner of the box <inline-formula>
<mml:math id="M133">
<mml:mrow>
<mml:mi>O</mml:mi>
<mml:msub>
<mml:mover accent="true">
<mml:mi>X</mml:mi>
<mml:mo>&#x02DC;</mml:mo>
</mml:mover>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:msup>
<mml:mi>T</mml:mi>
<mml:mo>&#x2032;</mml:mo>
</mml:msup>
<mml:msubsup>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
<mml:mrow>
<mml:mi>max</mml:mi>
</mml:mrow>
</mml:msubsup>
<mml:mo>.</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula></p>
<p>We now turn our attention to the non-traded block. Although the system has a full equilibrium via the t&#x00E2;tonnement process, we will focus on outlining the intuition here. The relative price <inline-formula>
<mml:math id="M134">
<mml:mrow>
<mml:msub>
<mml:mi>P</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is determined endogenously from domestic supply and demand conditions. While we specify the demand equations presently, it is worthwhile to briefly outline how the non-traded block attains an equilibrium. Given the domestic demand and supply for good 4, the equilibrium price <inline-formula>
<mml:math id="M135">
<mml:mrow>
<mml:msubsup>
<mml:mi>P</mml:mi>
<mml:mn>4</mml:mn>
<mml:mo>&#x2217;</mml:mo>
</mml:msubsup>
</mml:mrow>
</mml:math>
</inline-formula> follows from the market clearing equilibrium. This price then feeds into <xref ref-type="disp-formula" rid="EQ14">equation (13)</xref> which, together with <xref ref-type="disp-formula" rid="EQ13">equation (12)</xref>, determines the rental on land, <inline-formula>
<mml:math id="M136">
<mml:mi>&#x03C0;</mml:mi>
</mml:math>
</inline-formula>, and the wages of unskilled labor, <inline-formula>
<mml:math id="M137">
<mml:mrow>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. The overall general equilibrium for the non-traded block can be visualized in the standard manner, as the point of tangency between the PPC drawn in the <inline-formula>
<mml:math id="M138">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> space and the relative price line.</p>
<p>We now specify the details of the demand side of the model. In contrast to standard general equilibrium analysis which assumes that all agents consume all goods, thereby allowing for aggregate preferences to be depicted using a representative agent, in this study, we assume that one section of society is not able to consume one good. Specifically, we assume that there is a group in society that is not digitally literate; in our model, this group that suffers from digital exclusion comprises unskilled workers, <inline-formula>
<mml:math id="M139">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. We assume that the rest of the population&#x2014;owners of both types of capital, land, and skilled workers&#x2014;are all digitally literate and are, consequently, able to utilize good 1. In what follows, we label variables related to the digitally excluded group with the superscript &#x201C;<inline-formula>
<mml:math id="M140">
<mml:mi>e</mml:mi>
</mml:math>
</inline-formula>&#x201D; and the remainder of society that is not digitally excluded with &#x201C;<inline-formula>
<mml:math id="M141">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula>&#x201D;. As a result of digital exclusion, the <inline-formula>
<mml:math id="M142">
<mml:mi>e</mml:mi>
</mml:math>
</inline-formula> group only consumes three goods, and the demand for these are: <inline-formula>
<mml:math id="M143">
<mml:mrow>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>2</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
<mml:mo>,</mml:mo>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>3</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
</mml:mrow>
</mml:math>
</inline-formula>, and <inline-formula>
<mml:math id="M144">
<mml:mrow>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>4</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
</mml:mrow>
</mml:math>
</inline-formula>. The utility that the excluded group derives from this is <inline-formula>
<mml:math id="M145">
<mml:mrow>
<mml:msup>
<mml:mi>U</mml:mi>
<mml:mi>e</mml:mi>
</mml:msup>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>2</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
<mml:mo>,</mml:mo>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>3</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
<mml:mo>,</mml:mo>
<mml:mi>a</mml:mi>
<mml:mi>n</mml:mi>
<mml:mi>d</mml:mi>
<mml:mspace width="thickmathspace"/>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>4</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>.</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula> On the other hand, the <inline-formula>
<mml:math id="M146">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> group consumes all four goods and has demands <inline-formula>
<mml:math id="M147">
<mml:mrow>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>1</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
<mml:mo>,</mml:mo>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>2</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
<mml:mo>,</mml:mo>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>3</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
</mml:mrow>
</mml:math>
</inline-formula>, and <inline-formula>
<mml:math id="M148">
<mml:mrow>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>4</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
</mml:mrow>
</mml:math>
</inline-formula>, which generates some social welfare <inline-formula>
<mml:math id="M149">
<mml:mrow>
<mml:msup>
<mml:mi>U</mml:mi>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msup>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>1</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>2</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>3</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
<mml:mi mathvariant="normal">,</mml:mi>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>4</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</inline-formula>. The demand and supply balance equations are given by <xref ref-type="disp-formula" rid="EQ1">(14)</xref>&#x2013;<xref ref-type="disp-formula" rid="EQ17">(17)</xref> below:</p>
<disp-formula id="EQ14">
<label>(14)</label>
<mml:math id="M150">
<mml:mrow>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>1</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>I</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<p>where <inline-formula>
<mml:math id="M151">
<mml:mrow>
<mml:mi>I</mml:mi>
<mml:mspace width="thickmathspace"/>
</mml:mrow>
</mml:math>
</inline-formula>denotes imports of good 1.</p>
<disp-formula id="EQ15">
<label>(15)</label>
<mml:math id="M152">
<mml:mrow>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>2</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
<mml:mo>+</mml:mo>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>2</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>E</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<p>where <inline-formula>
<mml:math id="M153">
<mml:mrow>
<mml:msub>
<mml:mi>E</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> denotes exports of good 2.</p>
<p>The markets for goods 3 and 4 clear locally, hence:</p>
<disp-formula id="EQ16">
<label>(16)</label>
<mml:math id="M154">
<mml:mrow>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>3</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
<mml:mo>+</mml:mo>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>3</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ17">
<label>(17)</label>
<mml:math id="M155">
<mml:mrow>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>4</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
<mml:mo>+</mml:mo>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>4</mml:mn>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msubsup>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<p>As mentioned earlier, the model also has separation of factor ownership, with the <inline-formula>
<mml:math id="M156">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> group owning <inline-formula>
<mml:math id="M157">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>,</mml:mo>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
<mml:mo>,</mml:mo>
<mml:mi>T</mml:mi>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula>and <inline-formula>
<mml:math id="M158">
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. The income (<inline-formula>
<mml:math id="M159">
<mml:mrow>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>) of owners of A&#x0026;AI capital, the income (<inline-formula>
<mml:math id="M160">
<mml:mrow>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:msub>
<mml:mo stretchy="false">)</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula> of the owners of general-purpose capital, the income (<inline-formula>
<mml:math id="M161">
<mml:mrow>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mi>T</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>) of owners of land, and the income (<inline-formula>
<mml:math id="M162">
<mml:mrow>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>) of skilled labor are described in <xref ref-type="disp-formula" rid="EQ17">equations (18)</xref>&#x2013;<xref ref-type="disp-formula" rid="EQ20">(21)</xref> below:</p>
<disp-formula id="EQ18">
<label>(18)</label>
<mml:math id="M163">
<mml:mrow>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mi>R</mml:mi>
<mml:msub>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ19">
<label>(19)</label>
<mml:math id="M164">
<mml:mrow>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mi>r</mml:mi>
<mml:msub>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ20">
<label>(20)</label>
<mml:math id="M165">
<mml:mrow>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mi>T</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mi>&#x03C0;</mml:mi>
<mml:mover accent="true">
<mml:mi>T</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ21">
<label>(21)</label>
<mml:math id="M166">
<mml:mrow>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
<mml:msub>
<mml:mover accent="true">
<mml:mi>L</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<p>Here, <inline-formula>
<mml:math id="M167">
<mml:mrow>
<mml:msub>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, <inline-formula>
<mml:math id="M168">
<mml:mrow>
<mml:msub>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, <inline-formula>
<mml:math id="M169">
<mml:mover accent="true">
<mml:mi>T</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
</mml:math>
</inline-formula>, and <inline-formula>
<mml:math id="M170">
<mml:mrow>
<mml:msub>
<mml:mover accent="true">
<mml:mi>L</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> represent the economy&#x2019;s stock of these factors. Hence, the <inline-formula>
<mml:math id="M171">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
<mml:mspace width="thickmathspace"/>
</mml:mrow>
</mml:math>
</inline-formula>group&#x2019;s aggregate income can be written as follows:</p>
<disp-formula id="EQ22">
<label>(22)</label>
<mml:math id="M172">
<mml:mrow>
<mml:msup>
<mml:mi>Y</mml:mi>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msup>
<mml:mo>=</mml:mo>
<mml:mi>R</mml:mi>
<mml:msub>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:mi>r</mml:mi>
<mml:msub>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>g</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:mi>&#x03C0;</mml:mi>
<mml:mover accent="true">
<mml:mi>T</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
<mml:msub>
<mml:mover accent="true">
<mml:mi>L</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<p>It is worth noting that we do not put restrictions on ownership of capital and land in the model other than the fact that unskilled labor is excluded from owning these assets. Within the non-excluded group, <inline-formula>
<mml:math id="M173">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula>, households that supply skilled labor may own either type of capital or land. The <inline-formula>
<mml:math id="M174">
<mml:mrow>
<mml:mi>e</mml:mi>
<mml:mspace width="thickmathspace"/>
</mml:mrow>
</mml:math>
</inline-formula>group only owns unskilled labor, and therefore its income (<inline-formula>
<mml:math id="M175">
<mml:mrow>
<mml:msup>
<mml:mi>Y</mml:mi>
<mml:mi>e</mml:mi>
</mml:msup>
</mml:mrow>
</mml:math>
</inline-formula>) is the same as the income of the unskilled workers, <inline-formula>
<mml:math id="M176">
<mml:mrow>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>:</p>
<disp-formula id="EQ23">
<label>(23)</label>
<mml:math id="M177">
<mml:mrow>
<mml:msup>
<mml:mi>Y</mml:mi>
<mml:mi>e</mml:mi>
</mml:msup>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:msub>
<mml:mover accent="true">
<mml:mi>L</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<p>Assuming factor price flexibility and an interior solution, the standard full employment conditions are given by the equations <xref rid="EQ24" ref-type="disp-formula">(24)</xref>&#x2013;<xref rid="EQ28" ref-type="disp-formula">(28)</xref> below:</p>
<disp-formula id="EQ24">
<label>(24)</label>
<mml:math id="M178">
<mml:mrow>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>g</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ25">
<label>(25)</label>
<mml:math id="M179">
<mml:mrow>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>s</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>s</mml:mi>
<mml:mn>2</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mover accent="true">
<mml:mi>L</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ26">
<label>(26)</label>
<mml:math id="M180">
<mml:mrow>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>i</mml:mi>
<mml:mn>1</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ27">
<label>(27)</label>
<mml:math id="M181">
<mml:mrow>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>T</mml:mi>
<mml:mn>3</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>T</mml:mi>
<mml:mn>4</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mover accent="true">
<mml:mi>T</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ28">
<label>(28)</label>
<mml:math id="M182">
<mml:mrow>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>u</mml:mi>
<mml:mn>3</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>u</mml:mi>
<mml:mn>4</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mover accent="true">
<mml:mi>L</mml:mi>
<mml:mo>&#x00AF;</mml:mo>
</mml:mover>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<p>Finally, we complete the specification of the model with the balance of payment condition in equation <xref ref-type="disp-formula" rid="EQ29">(29)</xref>:</p>
<disp-formula id="EQ29">
<label>(29)</label>
<mml:math id="M183">
<mml:mrow>
<mml:mi>P</mml:mi>
<mml:msub>
<mml:mi>E</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>I</mml:mi>
<mml:mn>1</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
</sec>
<sec id="sec3">
<label>3</label>
<title>The implications of a growth in A&#x0026;AI capital</title>
<p>To track the impact of accumulation of A&#x0026;AI capital on the welfare of various sections, we need to specify the income accruing to households from ownership of different factors of production. The <xref ref-type="disp-formula" rid="EQ17">equations (18)</xref>&#x2013;<xref ref-type="disp-formula" rid="EQ22">(23)</xref> describe these incomes and are useful for tracking the manner in which parametric changes affect the distribution of income across the excluded group, <inline-formula>
<mml:math id="M184">
<mml:mi>e</mml:mi>
</mml:math>
</inline-formula>, which derives the income <inline-formula>
<mml:math id="M185">
<mml:mrow>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, and the non-excluded group, <inline-formula>
<mml:math id="M186">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula>, which derives income <inline-formula>
<mml:math id="M187">
<mml:mrow>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mi>T</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mi>Y</mml:mi>
<mml:mrow>
<mml:msub>
<mml:mi>L</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. To achieve our results, we first obtain a relation between <inline-formula>
<mml:math id="M188">
<mml:mrow>
<mml:msub>
<mml:mi>P</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>,</mml:mo>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, and <inline-formula>
<mml:math id="M189">
<mml:mi>&#x03C0;</mml:mi>
</mml:math>
</inline-formula>. Letting <inline-formula>
<mml:math id="M190">
<mml:mrow>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mrow>
<mml:mi>m</mml:mi>
<mml:mi>n</mml:mi>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> denote the distributive share of factor <inline-formula>
<mml:math id="M191">
<mml:mi>m</mml:mi>
</mml:math>
</inline-formula> in sector <inline-formula>
<mml:math id="M192">
<mml:mi>n</mml:mi>
</mml:math>
</inline-formula> and using the &#x2018;<inline-formula>
<mml:math id="M193">
<mml:mo>&#x0302;</mml:mo>
</mml:math>
</inline-formula>&#x2019; notation to represent proportional change, the standard manipulations of the <inline-formula>
<mml:math id="M194">
<mml:mrow>
<mml:msub>
<mml:mi>a</mml:mi>
<mml:mrow>
<mml:mi>m</mml:mi>
<mml:mi>n</mml:mi>
</mml:mrow>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> system yield:</p>
<disp-formula id="EQ30">
<label>(30)</label>
<mml:math id="M195">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>w</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mo>&#x2212;</mml:mo>
<mml:mfrac>
<mml:mrow>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mrow>
<mml:mi>T</mml:mi>
<mml:mn>3</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
<mml:mrow>
<mml:mrow>
<mml:mo>|</mml:mo>
<mml:mi>&#x03B8;</mml:mi>
<mml:mo>|</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:mfrac>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>P</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ31">
<label>(31)</label>
<mml:math id="M196">
<mml:mrow>
<mml:mover accent="true">
<mml:mi>&#x03C0;</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
<mml:mo>=</mml:mo>
<mml:mfrac>
<mml:mrow>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mrow>
<mml:mi>u</mml:mi>
<mml:mn>3</mml:mn>
</mml:mrow>
</mml:msub>
</mml:mrow>
<mml:mrow>
<mml:mrow>
<mml:mo>|</mml:mo>
<mml:mi>&#x03B8;</mml:mi>
<mml:mo>|</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:mfrac>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>P</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<p>where <inline-formula>
<mml:math id="M197">
<mml:mrow>
<mml:mrow>
<mml:mo>|</mml:mo>
<mml:mi>&#x03B8;</mml:mi>
<mml:mo>|</mml:mo>
</mml:mrow>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mrow>
<mml:mi>u</mml:mi>
<mml:mn>3</mml:mn>
</mml:mrow>
</mml:msub>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mrow>
<mml:mi>u</mml:mi>
<mml:mn>4</mml:mn>
</mml:mrow>
</mml:msub>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</inline-formula>. It follows that <inline-formula>
<mml:math id="M198">
<mml:mrow>
<mml:mrow>
<mml:mo>|</mml:mo>
<mml:mi>&#x03B8;</mml:mi>
<mml:mo>|</mml:mo>
</mml:mrow>
<mml:mo>&#x2277;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula> as <inline-formula>
<mml:math id="M199">
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mo>&#x2277;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula>.</p>
<p>Assuming <inline-formula>
<mml:math id="M200">
<mml:mrow>
<mml:msub>
<mml:mover accent="true">
<mml:mi>P</mml:mi>
<mml:mo>^</mml:mo>
</mml:mover>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
<mml:mo>,</mml:mo>
</mml:mrow>
</mml:math>
</inline-formula>we have the classical Stolper&#x2013;Samuelson theorem results:</p>
<disp-formula id="EQ32">
<label>(32)</label>
<mml:math id="M201">
<mml:mrow>
<mml:mrow>
<mml:mo>{</mml:mo>
<mml:mrow>
<mml:mtable>
<mml:mtr>
<mml:mtd>
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>w</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
<mml:mspace width="thickmathspace"/>
<mml:mi mathvariant="normal">for</mml:mi>
<mml:mspace width="thickmathspace"/>
<mml:mrow>
<mml:mo>|</mml:mo>
<mml:mi>&#x03B8;</mml:mi>
<mml:mo>|</mml:mo>
</mml:mrow>
<mml:mo>&#x003C;</mml:mo>
<mml:mn>0</mml:mn>
<mml:mspace width="thickmathspace"/>
</mml:mrow>
</mml:mtd>
</mml:mtr>
<mml:mtr>
<mml:mtd>
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>w</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:mo>&#x003C;</mml:mo>
<mml:mn>0</mml:mn>
<mml:mspace width="thickmathspace"/>
<mml:mi mathvariant="normal">for</mml:mi>
<mml:mspace width="thickmathspace"/>
<mml:mrow>
<mml:mo>|</mml:mo>
<mml:mi>&#x03B8;</mml:mi>
<mml:mo>|</mml:mo>
</mml:mrow>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:mtd>
</mml:mtr>
<mml:mtr>
<mml:mtd>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>&#x03C0;</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
<mml:mspace width="thickmathspace"/>
<mml:mi mathvariant="normal">for</mml:mi>
<mml:mspace width="thickmathspace"/>
<mml:mrow>
<mml:mo>|</mml:mo>
<mml:mi>&#x03B8;</mml:mi>
<mml:mo>|</mml:mo>
</mml:mrow>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:mtd>
</mml:mtr>
<mml:mtr>
<mml:mtd>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>&#x03C0;</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
<mml:mo>&#x003C;</mml:mo>
<mml:mn>0</mml:mn>
<mml:mspace width="thickmathspace"/>
<mml:mi mathvariant="normal">for</mml:mi>
<mml:mspace width="thickmathspace"/>
<mml:mrow>
<mml:mo>|</mml:mo>
<mml:mi>&#x03B8;</mml:mi>
<mml:mo>|</mml:mo>
</mml:mrow>
<mml:mo>&#x003C;</mml:mo>
<mml:mn>0</mml:mn>
<mml:mspace width="thickmathspace"/>
</mml:mrow>
</mml:mtd>
</mml:mtr>
</mml:mtable>
</mml:mrow>
</mml:mrow>
</mml:mrow>
</mml:math>
</disp-formula>
<p>Now, suppose A&#x0026;AI becomes more prevalent in the digital sector through the accumulation of <inline-formula>
<mml:math id="M202">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. As we are dealing with a small open economy, the terms-of-trade remains constant when <inline-formula>
<mml:math id="M203">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> changes. Hence, from <xref ref-type="disp-formula" rid="EQ1">equation (1)</xref>, it follows that:</p>
<disp-formula id="EQ33">
<label>(33)</label>
<mml:math id="M204">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>X</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mn>1</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mi>A</mml:mi>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
<mml:mi mathvariant="normal">&#x2009;and&#x2009;</mml:mi>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>X</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mn>2</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math></disp-formula>
<p>The output of <inline-formula>
<mml:math id="M206">
<mml:mrow>
<mml:msub>
<mml:mi>X</mml:mi>
<mml:mn>2</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> cannot change as both the skilled labor and mobile capital have not changed, and the capital intensity cannot change as prices are fixed. However, there <italic>are</italic> price effects in the non-traded good sector, as the two blocks are linked via income effects. The expressions for each factor&#x2019;s income change are given below, which are derived from <xref ref-type="disp-formula" rid="EQ17">equations (18)</xref>&#x2013;<xref ref-type="disp-formula" rid="EQ19">(20)</xref> and <xref ref-type="disp-formula" rid="EQ21">(22)</xref>:</p>
<disp-formula id="EQ34">
<label>(34)</label>
<mml:math id="M207">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>Y</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ35">
<label>(35)</label>
<mml:math id="M208">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>Y</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>g</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>Y</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>s</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ36">
<label>(36)</label>
<mml:math id="M209">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>Y</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>T</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mover accent="true">
<mml:mi>&#x03C0;</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
</mml:math>
</disp-formula>
<disp-formula id="EQ37">
<label>(37)</label>
<mml:math id="M210">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>Y</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>w</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</disp-formula>
<p>It follows from <xref ref-type="disp-formula" rid="EQ34">equation (34)</xref> that the income of the owners of <inline-formula>
<mml:math id="M211">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> always increases from the growth of A&#x0026;AI capital, while the owners of <inline-formula>
<mml:math id="M212">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> observed that their incomes are unchanged (<xref ref-type="disp-formula" rid="EQ34">equation 35</xref>). In aggregate, the owners of capital do benefit from the growth in AI technology. This is not particularly surprising because they are the primary beneficiaries of the accumulation in A&#x0026;AI capital. On the other hand, <xref ref-type="disp-formula" rid="EQ35">equation (35)</xref> implies that skilled labor does not benefit from the accumulation of <inline-formula>
<mml:math id="M213">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>; essentially, because skilled labor works in the traded sector in our model, its returns are fixed through the small country assumption (and, moreover, there is no change in the stock of general-purpose capital <inline-formula>
<mml:math id="M214">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>g</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> in the comparative static case considered here). These outcomes are shown in Proposition 1.</p>
<disp-quote>
<p>Proposition 1: In a situation where skilled labor works in the traded sectors of the economy, the accumulation of A&#x0026;AI capital <inline-formula>
<mml:math id="M215">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> does not alter their real income. However, owners of capital are always better off from the growth in <inline-formula>
<mml:math id="M216">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> in terms of receiving a higher income.</p>
</disp-quote>
<p><xref ref-type="disp-formula" rid="EQ35">Equations (36)</xref> and <xref ref-type="disp-formula" rid="EQ36">(37)</xref>suggest that the incomes of owners of land and unskilled workers depend on the change in the rental for land (<inline-formula>
<mml:math id="M217">
<mml:mrow>
<mml:mover accent="true">
<mml:mi>&#x03C0;</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
</mml:math>
</inline-formula>) and unskilled labor wages (<inline-formula>
<mml:math id="M218">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>w</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>); these factor prices change because of income effects that connect the traded block with the non-traded block. There are two links that we need to keep track of to evaluate these changes: one between <inline-formula>
<mml:math id="M219">
<mml:mrow>
<mml:msub>
<mml:mi>K</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M220">
<mml:mrow>
<mml:msub>
<mml:mi>P</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> and the other between <inline-formula>
<mml:math id="M221">
<mml:mrow>
<mml:msub>
<mml:mi>P</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>,</mml:mo>
<mml:mi>&#x03C0;</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula>, and <inline-formula>
<mml:math id="M222">
<mml:mrow>
<mml:msub>
<mml:mi>w</mml:mi>
<mml:mi>u</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>. The latter is already described in <xref ref-type="disp-formula" rid="EQ29">equations (30)</xref> and <xref ref-type="disp-formula" rid="EQ29">(31)</xref>. To derive the former, we utilize the supply and demand equation for Sector 4, and the equations for changes in <inline-formula>
<mml:math id="M223">
<mml:mrow>
<mml:msup>
<mml:mi>Y</mml:mi>
<mml:mi>e</mml:mi>
</mml:msup>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M224">
<mml:mrow>
<mml:msup>
<mml:mi>Y</mml:mi>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msup>
</mml:mrow>
</mml:math>
</inline-formula> to obtain are as follows:</p>
<disp-formula id="EQ38">
<label>(38)</label>
<mml:math id="M225">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>P</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:mo>&#x2212;</mml:mo>
<mml:mfrac>
<mml:mrow>
<mml:msubsup>
<mml:mi>&#x03B7;</mml:mi>
<mml:mn>4</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>i</mml:mi>
</mml:msub>
</mml:mrow>
<mml:mi>Z</mml:mi>
</mml:mfrac>
</mml:mrow>
</mml:math>
</disp-formula>
<p>where <inline-formula>
<mml:math id="M226">
<mml:mrow>
<mml:mi>Z</mml:mi>
<mml:mo>=</mml:mo>
<mml:mrow>
<mml:mo>[</mml:mo>
<mml:mrow>
<mml:mi>A</mml:mi>
<mml:mo>+</mml:mo>
<mml:msubsup>
<mml:mi>&#x03B7;</mml:mi>
<mml:mn>4</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
<mml:mfrac>
<mml:mrow>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mi>T</mml:mi>
</mml:msub>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
<mml:mrow>
<mml:mrow>
<mml:mo>|</mml:mo>
<mml:mi>&#x03B8;</mml:mi>
<mml:mo>|</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:mfrac>
<mml:mo>&#x2212;</mml:mo>
<mml:mfrac>
<mml:mrow>
<mml:msubsup>
<mml:mi>&#x03B7;</mml:mi>
<mml:mn>4</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
<mml:mrow>
<mml:mrow>
<mml:mo>|</mml:mo>
<mml:mi>&#x03B8;</mml:mi>
<mml:mo>|</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:mfrac>
</mml:mrow>
<mml:mo>]</mml:mo>
</mml:mrow>
<mml:mo>&#x003C;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula> due to Walrasian stability. The terms are <inline-formula>
<mml:math id="M227">
<mml:mrow>
<mml:msubsup>
<mml:mi>&#x03B7;</mml:mi>
<mml:mn>4</mml:mn>
<mml:mi>e</mml:mi>
</mml:msubsup>
<mml:mo>,</mml:mo>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>,</mml:mo>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mi>T</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, and <inline-formula>
<mml:math id="M228">
<mml:mrow>
<mml:msub>
<mml:mi>&#x03B8;</mml:mi>
<mml:mi>s</mml:mi>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>, respectively, the income elasticity for consuming good 4 by group <inline-formula>
<mml:math id="M229">
<mml:mi>e</mml:mi>
</mml:math>
</inline-formula>, the share of A&#x0026;AI income in the <inline-formula>
<mml:math id="M230">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> group income, the share of land income in the <inline-formula>
<mml:math id="M231">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> group income, and the share of skilled labor income in the <inline-formula>
<mml:math id="M232">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> group income. It follows that <inline-formula>
<mml:math id="M233">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>P</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mn>4</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula> is always positive. This is fairly intuitive: the demand curve for good 4 shifts to the right due to income effects, and the supply curve does not change because the production possibility curve for the non-traded good sector does not change.</p>
<p>We are now in a position to explicitly state who gains and who loses from the accumulation of A&#x0026;AI capital. From <xref ref-type="disp-formula" rid="EQ29">equations (30)</xref>, <xref ref-type="disp-formula" rid="EQ30">(31)</xref>, and <xref ref-type="disp-formula" rid="EQ38">(38)</xref>, it is clear that the answer depends on the sign of <inline-formula>
<mml:math id="M234">
<mml:mrow>
<mml:mrow>
<mml:mo>|</mml:mo>
<mml:mi>&#x03B8;</mml:mi>
<mml:mo>|</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</inline-formula>, which, in turn, depends on the sign of (<inline-formula>
<mml:math id="M235">
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
</mml:mrow>
</mml:math>
</inline-formula>). Specifically, when <inline-formula>
<mml:math id="M236">
<mml:mrow>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula>, we have that <inline-formula>
<mml:math id="M237">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>w</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:mo>&#x003C;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula> and <inline-formula>
<mml:math id="M238">
<mml:mrow>
<mml:mover accent="true">
<mml:mi>&#x03C0;</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula>; the reverse holds when <inline-formula>
<mml:math id="M239">
<mml:mrow>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
<mml:mo>&#x003C;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula>. <xref ref-type="disp-formula" rid="EQ21">Equations (22)</xref> and <xref ref-type="disp-formula" rid="EQ22">(23)</xref> yield the following propositions.</p>
<disp-quote>
<p>Proposition 2: Suppose Sector 4 is more land-intensive, that is, <inline-formula>
<mml:math id="M240">
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula>. In this case, the growth of AI technology increases the income of land-owners and reduces the income of unskilled labor. Overall, the group <inline-formula>
<mml:math id="M241">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> is necessarily better off from the growth of AI technology. On the other hand, unskilled labor that forms the group <inline-formula>
<mml:math id="M242">
<mml:mi>e</mml:mi>
</mml:math>
</inline-formula> is worse-off from the lower real income it receives.</p>
</disp-quote>
<p>Proposition 2 highlights that technological exclusion can lead to an increase in inequality when certain sections of society do not have access to the high-tech industry. This occurs even though no jobs are lost to the expanding AI technology and the excluded continue to be fully employed. Rather, the result is driven by the lowering of wages for unskilled labor due to the expanding high-tech sector. The logic of &#x2018;trickle-down&#x2019; economics fails in this case even in the non-traded sector, which uses land and unskilled work as its primary inputs, the main beneficiaries of the growth in A&#x0026;AI technology are the owners of land if the prices of the good that utilizes land more intensively were to rise.</p>
<p>Proposition 3 below shows that the outcome need not be so dire for the unskilled workers if the sector with the rise in relative prices of goods is intensive in unskilled labor.</p>
<disp-quote>
<p>Proposition 3: Suppose Sector 4 uses unskilled labor intensively, that is, <inline-formula>
<mml:math id="M243">
<mml:mrow>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>&#x2212;</mml:mo>
<mml:msub>
<mml:mi>t</mml:mi>
<mml:mn>3</mml:mn>
</mml:msub>
<mml:mo>&#x003C;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula>. Then, the growth of AI technology increases the income of unskilled labor and reduces the income of the owners of land. This implies that the overall welfare impact on the group <inline-formula>
<mml:math id="M244">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:math>
</inline-formula> is ambiguous.</p>
</disp-quote>
<p>Proposition 3 suggests that it is possible that the wages of unskilled labor rise <inline-formula>
<mml:math id="M245">
<mml:mrow>
<mml:mrow>
<mml:mo>(</mml:mo>
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>w</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>u</mml:mi>
</mml:msub>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
<mml:mo>)</mml:mo>
</mml:mrow>
</mml:mrow>
</mml:math>
</inline-formula> when the income effects, arising from the changes in Sector 1, result in an increase in price (<inline-formula>
<mml:math id="M246">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>P</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mn>4</mml:mn>
</mml:msub>
<mml:mo>&#x003E;</mml:mo>
<mml:mn>0</mml:mn>
</mml:mrow>
</mml:math>
</inline-formula>) of the good that intensively uses unskilled labor. Trickle-down economics does work in this instance, as unskilled labor benefits in terms of higher income from the growth of the high-tech sector even though they face technological exclusion. On the other hand, we have that <inline-formula>
<mml:math id="M247">
<mml:mrow>
<mml:msup>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>Y</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
</mml:mrow>
</mml:msup>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>g</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:mover accent="true">
<mml:mi>&#x03C0;</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
<mml:mo>+</mml:mo>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>L</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>s</mml:mi>
</mml:msub>
<mml:mo>=</mml:mo>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>i</mml:mi>
</mml:msub>
<mml:mo>+</mml:mo>
<mml:mover accent="true">
<mml:mi>&#x03C0;</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
</mml:math>
</inline-formula>. The ambiguity in the overall welfare impact on the <inline-formula>
<mml:math id="M248">
<mml:mrow>
<mml:mi>n</mml:mi>
<mml:mi>e</mml:mi>
<mml:mspace width="thickmathspace"/>
</mml:mrow>
</mml:math>
</inline-formula>group arises from the fact that, in Proposition 3, we have <inline-formula>
<mml:math id="M249">
<mml:mrow>
<mml:msub>
<mml:mrow>
<mml:mover accent="true">
<mml:mi>K</mml:mi>
<mml:mo stretchy="true">^</mml:mo>
</mml:mover>
</mml:mrow>
<mml:mi>i</mml:mi>
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</mml:mrow>
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</inline-formula>. This yields the possibility of a somewhat counterintuitive outcome: the non-excluded group is actually worse-off from the advancements in AI, even though they are the owners of the new technology that is growing, they are not excluded from consuming the high-tech good and, importantly, they do not lose jobs to AI. This leads to some interesting political economy outcomes. Given that the agents who bear the brunt of the negative impact in this case &#x2013; land owners &#x2013; are not without political power, we can see why there may be a push by land-owners to halt advancements in AI, which provides some intuition to why vested interests may seek to block the advancement of AI technology, even when it has no employment consequences.</p>
<p>Finally, we can explicitly bring out the impact of consumption exclusion on this model. The primary effect of the increase in <inline-formula>
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<mml:msub>
<mml:mi>K</mml:mi>
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</inline-formula>; however, the excluded group of unskilled workers cannot enjoy any of this increase in output. Intuitively, for any particular income <inline-formula>
<mml:math id="M256">
<mml:mrow>
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</inline-formula> will choose consumption optimally to maximize their utility. Given that they do not consume <inline-formula>
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<mml:mrow>
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<mml:mi>D</mml:mi>
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</inline-formula> represent their optimal demands, their (aggregate) welfare can be measured through their utility level <inline-formula>
<mml:math id="M261">
<mml:mrow>
<mml:msup>
<mml:mi>U</mml:mi>
<mml:mi>e</mml:mi>
</mml:msup>
<mml:mrow>
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<mml:mrow>
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<mml:mrow>
<mml:mi>e</mml:mi>
<mml:mo>&#x2217;</mml:mo>
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</mml:msubsup>
<mml:mo>,</mml:mo>
<mml:msubsup>
<mml:mi>D</mml:mi>
<mml:mn>3</mml:mn>
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<mml:mo>&#x2217;</mml:mo>
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</mml:msubsup>
<mml:mo>,</mml:mo>
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<mml:mi>D</mml:mi>
<mml:mn>4</mml:mn>
<mml:mrow>
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</mml:mrow>
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</inline-formula>. This must necessarily be lower than their utility (given the same income and prices) if they did not have the constraint of consumption exclusion, in which case their optimal utility would be <inline-formula>
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<mml:mo>,</mml:mo>
<mml:msubsup>
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<mml:msubsup>
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</mml:mrow>
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</mml:mrow>
</mml:mrow>
</mml:math>
</inline-formula>; since the outcome in this unconstrained optimization can always set <inline-formula>
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<mml:mrow>
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<mml:mo>=</mml:mo>
<mml:mn>0</mml:mn>
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</mml:mrow>
</mml:math>
</inline-formula>, which does not include any change in consumption of good 1 and thereby lowers their welfare changes compared with a representative agent model, where the excluded group can consume all four goods.</p>
</sec>
<sec sec-type="conclusions" id="sec4">
<label>4</label>
<title>Conclusion</title>
<p>Advancement in A&#x0026;AI is occurring at a rapid pace, and its impact on employment, welfare, trade, and development is becoming the basis of a multidisciplinary research agenda. Using a trade-theoretic framework, we construct a stylized environment, where a specific group of society&#x2014;unskilled workers&#x2014;is excluded both from ownership of productive assets and the consumption of digital (high-tech) goods. While economists have largely focused on the impact of AI on employment, there is a growing concern, especially among sociologists, about how the digitally excluded population of the world will fare as AI advancements occur. Our simple model shows that the accumulation of AI capital may cause a lower income either for unskilled workers or owners of land, depending on the factor intensities in various sectors.</p>
<p>Our analysis has political economy implications. Specifically, if the unskilled workers are faced with a loss of income, then the main concern is the rising inequality in society and the potential for the economy to spiral into increasingly deleterious outcomes for excluded groups. Policymaking must tackle this problem. The classic policy response in this sort of circumstance is a tax-<italic>cum</italic>-subsidy scheme, where the agents who gain from a change are taxed and the proceeds are distributed to compensate those who lose out. Directly taxing the digital sector, however, can create distortions and inefficiencies of its own. One solution, then, is to tax a different sector, such as tourism, to gather revenues to subsidize the excluded groups. The rationale for this is that the tourism sector creates a distortion in the form of monopoly power in trade (<xref ref-type="bibr" rid="ref13">Hazari and Ng, 1993</xref>; <xref ref-type="bibr" rid="ref14">Hazari and Nowak, 2003</xref>).<xref ref-type="fn" rid="fn0011"><sup>11</sup></xref> Such a distortion needs to be corrected by imposing an optimal tax (or tariff) on tourism. As an optimal tax on tourism eliminates a distortion in the economy, it leads to welfare improvement; the revenue from this tax can then be used to subsidize the reduction in digital exclusion through education and training of excluded groups. Alternatively, given that a lack of infrastructure contributes to digital exclusion (as outlined in Section 1), the tax can also be used to finance infrastructure that provides better access to digital technologies for excluded groups. On the other hand, if the brunt of the loss in income is felt by land-owners, the problem that emerges is that this group may lobby for policies that discourage advancements in AI to preserve their benefits. Moreover, the revenue from a tax-and-subsidy scheme can be used to subsidize landowners as well. The policy response of regulators to these various pressures brought about by digital exclusion is, we believe, a fruitful avenue for future research.</p>
<p>One of the main drawbacks of our analysis is that it presumes a particular production structure where skilled workers play a neutral role. This was achieved by assuming that skilled labor works only in the traded block and is essentially necessitated by our desire to focus on the problems faced by the excluded groups. In certain contexts, however, there may be a need to model the four sectors in different ways than what we have done here, for example, allowing unskilled workers to work in the traded sector and skilled workers to work in the non-traded sector. Our analysis provides the theoretical framework to achieve this. Moreover, there is a need to calibrate the theoretical insights into data and simulations to gain further understanding of the magnitude of various effects.</p>
<p>Overall, at a very broad, theoretical, level, it is becoming apparent that traditional models of trade such as the Heckscher-Ohlin model may be inadequate to examine the global trade patterns that emerge as A&#x0026;AI becomes more prevalent. Our use of the Jones&#x2013;Manuelli function to capture A&#x0026;AI represents a continuation of the search for an appropriate theoretical structure that will prove to be useful to pin our thoughts from an international trade perspective. The Jones&#x2013;Manuelli production function gained popularity in its use in the endogenous growth literature. This link between A&#x0026;AI technology and endogenous growth has yet to be explored in the literature. The use of the Jones&#x2013;Manuelli production function to model A&#x0026;AI provides some guidance of how one may proceed to form this link theoretically.</p>
</sec>
<sec sec-type="data-availability" id="sec5">
<title>Data availability statement</title>
<p>The original contributions presented in the study are included in the article/supplementary material, further inquiries can be directed to the corresponding author.</p>
</sec>
<sec sec-type="author-contributions" id="sec6">
<title>Author contributions</title>
<p>BH: Conceptualization, Formal analysis, and Writing &#x2013; reviewing &#x0026; editing. VM: Conceptualization, Formal analysis, and Writing &#x2013; reviewing &#x0026; editing.</p>
</sec>
</body>
<back>
<sec sec-type="COI-statement" id="sec7">
<title>Conflict of interest</title>
<p>The authors are employed by Lattice Analytics Pty Ltd.</p>
</sec>
<sec id="sec100" sec-type="disclaimer">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
<fn-group>
<fn id="fn0001">
<p><sup>1</sup>See <ext-link xlink:href="https://openai.com/blog/chatgpt" ext-link-type="uri">https://openai.com/blog/chatgpt</ext-link> (accessed 2nd April 2023).</p>
</fn>
<fn id="fn0002">
<p><sup>2</sup>See <ext-link xlink:href="https://www.reuters.com/technology/chatgpt-sets-record-fastest-growing-user-base-analyst-note-2023-02-01/" ext-link-type="uri">https://www.reuters.com/technology/chatgpt-sets-record-fastest-growing-user-base-analyst-note-2023-02-01/</ext-link>. By comparison, Tik Tok took about 9&#x2009;months to get to the 100 million user mark, and Instagram took more than two years (see <ext-link xlink:href="https://www.theguardian.com/technology/2023/feb/02/chatgpt-100-million-users-open-ai-fastest-growing-app" ext-link-type="uri">https://www.theguardian.com/technology/2023/feb/02/chatgpt-100-million-users-open-ai-fastest-growing-app</ext-link>, accessed 2nd April 2023).</p>
</fn>
<fn id="fn0003">
<p><sup>3</sup>These technologies also pose regulatory and public policy challenges, an issue that warrants a monograph of its own and one that we do not attempt to tackle in this study.</p>
</fn>
<fn id="fn0004">
<p><sup>4</sup>See <xref ref-type="bibr" rid="ref27">Silver (1994)</xref>,<xref ref-type="bibr" rid="ref25">Rodgers et al. (1995)</xref>,<xref ref-type="bibr" rid="ref26">Sen (2000)</xref>, and <xref ref-type="bibr" rid="ref22">Levitas (2005)</xref> for insights into the general ideas behind social exclusion. <xref ref-type="bibr" rid="ref7">Burchardt et al. (2002)</xref> attempt to measure social exclusion along four dimensions: consumption, production, political engagement, and social. <xref ref-type="bibr" rid="ref12">Hazari and Mohan (2015)</xref> use these dimensions as a basis to present a rigorous general equilibrium modeling framework for social exclusion. Their model incorporates consumption, production, and political exclusion. The model developed in this study essentially adapts the general equilibrium framework of <xref ref-type="bibr" rid="ref12">Hazari and Mohan (2015)</xref> to the context of digital exclusion.</p>
</fn>
<fn id="fn0005">
<p><sup>5</sup>Bhutan, Cambodia, Djibouti, Lao P.D.R., Lesotho, Mauritania, Myanmar, Sao Tome and Principe, Senegal, and Tuvalu.</p>
</fn>
<fn id="fn0006">
<p><sup>6</sup>Burundi, Central African Republic, Chad, Democratic Republic of the Congo, Eritrea, Madagascar, Niger, Sierra Leone, Somalia, and South Sudan.</p>
</fn>
<fn id="fn0007">
<p><sup>7</sup>Coverage gap refers to a situation where access to mobile broadband is limited because the area is not covered by a mobile broadband signal.</p>
</fn>
<fn id="fn0008">
<p><sup>8</sup>Usage gap occurs because people are not using the Internet even though they are in an area covered by a broadband signal.</p>
</fn>
<fn id="fn0009">
<p><sup>9</sup>In other words, AI may be used both in the manufacture of <inline-formula><mml:math id="M267">
<mml:mrow>
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</fn>
<fn id="fn0011">
<p><sup>11</sup>Essentially tourism results in a distortion, where DRS = DRT &#x2260; FRT that is, the domestic rate of transformation (DRT) in production does not equal to the foreign rate of transformation (FRT).</p>
</fn>
</fn-group>
<ref-list>
<title>References</title>
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<citation citation-type="book"><person-group person-group-type="author"><name><surname>Aghion</surname> <given-names>P.</given-names></name> <name><surname>Jones</surname> <given-names>P. E.</given-names></name> <name><surname>Jones</surname> <given-names>C. I.</given-names></name></person-group> (<year>2017</year>). &#x201C;<article-title>Artificial intelligence and economic growth</article-title>&#x201D; in <source>The economics of artificial intelligence: An agenda</source>. eds. <person-group person-group-type="editor"><name><surname>Agarwal</surname> <given-names>A.</given-names></name> <name><surname>Gans</surname> <given-names>J.</given-names></name> <name><surname>Goldfarb</surname> <given-names>A.</given-names></name></person-group> (<publisher-loc>Chicago</publisher-loc>: <publisher-name>The University of Chicago Press</publisher-name>)</citation>
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