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ORIGINAL RESEARCH article

Front. Environ. Sci., 11 September 2025

Sec. Environmental Policy and Governance

Volume 13 - 2025 | https://doi.org/10.3389/fenvs.2025.1679245

How carbon taxes and subsidies affect the implementation of low-carbon housing? An evolutionary game theory analysis

Wenwen Lv
Wenwen Lv*Jun Li
Jun Li*
  • Logistics Department of Wuhan Fourth Hospital, Wuhan Fourth Hospital, Wuhan, China

Introduction: Subsidy policies and carbon tax policies are effective means of encouraging the development of low-carbon residential buildings. However, how to utilize these two policy tools of carbon tax and subsidies to more efficiently incentivize the development of low-carbon residential buildings remains a topic worthy of further exploration. This paper explores the mechanisms by which carbon tax and subsidies incentivize the implementation of low-carbon residential buildings and clarifies the boundary conditions for the effectiveness of these two policy tools.

Methods: We built a stochastic evolutionary game that couples three agent groups—government, real-estate developers, and homebuyers—and explicitly incorporates policy shocks (carbon tax vs. subsidy) and environmental noise. A series of Monte-Carlo simulations was run to trace the share of low-carbon developers and buyers over time; critical thresholds and noise boundaries separating qualitatively different regimes were identified with bifurcation analysis.

Results and discussion: The evolutionary process of low-carbon housing development, whether under a carbon tax policy or a low-carbon subsidy policy, includes three stages: (1) the initial stage, where relying solely on government subsidies or carbon taxes is insufficient to effectively implement low-carbon housing under various noise intensities; (2) the development stage, where as the proportions of real estate developers adopting low-carbon strategies and homebuyers purchasing low-carbon housing increase, a chaotic relationship emerges between the implementation of carbon taxes, subsidies, and low-carbon housing under certain noise intensities; and (3) the stable stage, where low-carbon housing can be successfully implemented and a qualitative leap is achieved when a certain threshold proportion of real estate developers and homebuyers adopt low-carbon strategies.

1 Introduction

The carbon emissions from China’s construction industry are the largest single source of national carbon emissions. In 2023, electricity consumption in building construction alone consumed 9.0 × 108 tons of standard coal equivalents. However, the promotion of low-carbon housing can effectively reduce carbon emissions from the construction sector Yao and Shao (2025). “Low-carbon housing” refer to residential buildings that minimize greenhouse gas emissions throughout their entire life cycle while maintaining or even exceeding the standard level of indoor comfort (Yao et al., 2023a). Subsidy policies and carbon tax policies are effective means of encouraging the development of low-carbon residential buildings (Liu Y. et al., 2024; Wang et al., 2025; Yu, 2020). However, how to utilize these two policy tools of carbon tax and subsidies to more efficiently incentivize the development of low-carbon residential buildings remains a topic worthy of further exploration. This paper explores the mechanisms by which carbon tax and subsidies incentivize the implementation of low-carbon residential buildings and clarifies the boundary conditions for the effectiveness of these two policy tools.

1.1 Advantages of carbon tax and subsidies

1.1.1 The scope of application for carbon taxes and subsidies is broader

Carbon tax, subsidies, and carbon trading are three common low-carbon incentive policies (Yang et al., 2024). However, compared with carbon emissions trading, the scope of application for carbon taxes and subsidies is broader (Hu and Tian, 2024; Ouyang et al., 2024). Given the complex trading mechanisms and high implementation costs, carbon trading has been primarily implemented in large-scale enterprises within specific industries. For instance, the power industry is currently the only sector included in the national carbon trading market. This selective inclusion is justified by two main factors: firstly, the carbon emission data from the power industry are more transparent and credible compared to other sectors; secondly, the power industry contributes significantly to the nation’s overall carbon emissions. In contrast, subsidies offer a more flexible and inclusive approach, as they can be widely applied across various industries, particularly benefiting enterprises with low carbon emissions and even individual citizens.

For residential products, significant carbon emissions arise during both the construction and use phases. These emissions are generated by construction firms and individual residents, respectively. Although real estate developers are key stakeholders in the residential sector, they do not directly emit carbon and thus cannot engage in carbon market transactions. While natural persons can theoretically participate in carbon market transactions, carbon emission exchanges have established stringent criteria for their involvement. Undoubtedly, these stringent criteria effectively preclude the majority of residents from participating in the carbon trading market, thereby undermining the fairness of the carbon trading mechanism. In contrast, carbon taxes and subsidies offer greater flexibility and can more effectively embody the principle of fairness.

1.1.2 The implementation costs of carbon taxes and subsidies are lower

Compared with carbon taxes and subsidies, the process of carbon trading is more complex (Luo et al., 2024; Xian et al., 2024; Yao and Shao, 2022). Carbon trading encompasses a variety of legal relationships across different stages, including total amount setting, quota allocation, and carbon emissions trading, and involves multiple entities such as governments, carbon trading platform institutions, emitters, carbon fixers, financial institutions, and approval institutions. The effective implementation of carbon trading relies on accurate carbon emissions data, stringent government regulation, efficient trading platforms, and extensive oversight from all sectors of society. In contrast, carbon taxes and subsidies are characterized by their directness and simplicity. Low-carbon subsidies represent direct financial support provided by the government to low-carbon projects or technologies, eliminating the need for complex market mechanisms or regulatory frameworks, and are relatively easy to implement and manage. Moreover, unlike carbon trading, carbon taxes and subsidies do not require detailed carbon emissions data and incur lower management costs.

1.2 Corporate decision-making under carbon tax and subsidy constraints

Existing research indicates that carbon taxes influence corporate low-carbon strategies through price signals, yet the magnitude of this effect hinges on factors such as the tax rate level, policy credibility, and the method of revenue recycling (Wu et al., 2024). A stable and gradually increasing carbon tax can prompt energy-intensive firms to accelerate the phase-out of carbon-intensive assets. Conversely, fluctuations or instability in the tax rate can undermine firms’ willingness to adopt low-carbon strategies (Xu and Liu, 2024). Moreover, firm heterogeneity—specifically size, financing structure, and absorptive capacity—further amplifies differences in responses: Companies with superior Environmental, Social, and Governance (ESG) performance are more sensitive in their emission reduction and Research and Development (R&D) responses to carbon taxes. Studies suggest that recycling tax revenues to firms in the form of reduced social security contributions can effectively alleviate competitiveness concerns and reinforce long-term emission reduction incentives, whereas one-off transfers to households may generate substitution effects. Overall, when implemented in conjunction with complementary policies such as R&D subsidies and green finance, carbon taxes can more effectively drive corporate decarbonization.

To spur innovation in certain fields, subsidies have been widely applied in areas such as agriculture, new energy vehicles, clean energy generation, high-tech, pharmaceuticals, and transportation. Depending on the target of the subsidy, the methods can include subsidies to manufacturers, retailers, or consumers (Lin and Zhang, 2024; Lyu et al., 2024; Yao et al., 2023b). The vast majority of scholars concur that government subsidies exert substantial incentive effects and effectively bolster firms’ innovation capabilities. Low-carbon subsidies, which are typically disbursed in the form of rewards, are utilized to spur the development of low-carbon industries. Empirical studies have examined the impact of subsidy policies on low-carbon development and have revealed that low-carbon subsidies not only foster the growth of low-carbon industries and clean energy but also significantly enhance the sales of low-carbon products. any researchers (Liu D. et al., 2024; Yu et al., 2024; Zhang and Yu, 2024), using game theory, have constructed models of emission reduction strategies for firms and consumers and explored the optimal subsidy strategies for low-carbon subsidies, providing valuable references for governments to formulate effective subsidy policies.

1.3 Optimization of carbon tax and subsidy policies

On the one hand, the government can reduce the economic costs incurred by enterprises in the process of low-carbon transition through subsidies, thereby improving the ecological environment (Lyu et al., 2024). On the other hand, subsidies mean that the government has to bear a higher fiscal burden, and the possibility of corporate subsidy fraud may also lead to the failure of the subsidy policy (Long et al., 2024). Although carbon taxes can motivate low-carbon behavior of enterprises, excessive taxes will increase the burden on enterprises, thereby curbing low-carbon innovation.

Low-carbon subsidies are a form of government-led, non-repayable financial payments to the recipients. The emphasis on optimizing subsidies is closely related to their mechanism of action: subsidies have both substitution and income effects, which increase the nominal income of the subsidized entities and affect the relative price system of enterprise products and input-output behavior. Existing research shows that different subsidy measures, targets, and intensities will affect the actual effect of subsidies (Cheng et al., 2024; Li et al., 2024). Therefore, although different subsidy measures have the common mechanism of incentive effect, they still show complex effects.

Overall, carbon taxes show regional differences in motivating corporate green behavior (Chai et al., 2025; Xia et al., 2024). In regions with high carbon intensity, carbon taxes exert a substantial inhibitory effect on carbon emissions. However, in areas with medium and low carbon intensity, such an inhibitory effect has yet to materialize. The academic community has reached a consensus on this perspective: although the imposition of carbon taxes facilitates industrial structure transformation, it exerts a significant negative impact on economic growth, resident consumption, and corporate income. As a result, carbon taxes fail to achieve the dual dividend effect of carbon reduction and economic growth in the short term. A carbon tax rate that is too low will be insufficient to meet carbon reduction targets, while an excessively high rate can have a pronounced adverse impact on the economy and lead to a decline in policy effectiveness. Therefore, exploring the appropriate tax rate and method of taxation is crucial for motivating corporate green behavior.

1.4 The contributions of this paper

Existing research has achieved relatively rich results in the impact mechanisms of carbon taxes and subsidies. However, these studies still have some shortcomings. In terms of research methods, even though many papers have conducted detailed analyses using evolutionary game models, they have failed to take into account the persistent stochastic disturbances existing in real life. That is to say, there are also stochastic disturbances in the process of strategy adjustment for both sides of the game. At this time, using only the general evolutionary game model will hardly reflect the real world. In addition, the incentive mechanisms of carbon taxes and subsidies for low-carbon residential buildings have not yet been clarified, especially the boundary conditions for the effectiveness of carbon taxes and subsidies are still unclear. This also to a great extent restricts the full play of the efficiency of environmental policies.

In response to the limitations of existing research, this thesis makes the following contributions:

A stochastic evolutionary game model that considers the impact of noise factors has been established by introducing Gaussian white noise. This improvement overcomes the shortcoming of existing models that fail to account for the uncertainty of a noisy environment, making the model more realistic and enhancing the reliability of the research findings.

The thesis elucidates the boundary conditions for the effectiveness of carbon taxes and subsidies in promoting low-carbon residential buildings. This achievement provides a foundation for improving the incentive efficiency of carbon taxes and subsidies, aiding in the optimization of environmental policy design and enhancing the effectiveness of these policy instruments.

2 Evolutionary game model of government subsidies

It is evident that environmental noise, housing buyers, real estate developers, and government subsidies all exert significant influence on the adoption of low-carbon housing. Consequently, this paper constructs evolutionary game models under both deterministic and uncertain conditions to investigate the impact of government subsidies on the adoption of low-carbon housing within these distinct contexts.

2.1 Assumptions

Assumption 1. It is assumed that the selling price of low-carbon houses is Pk2, while the selling price of regular traditional buildings is Pk1, and Pk2>Pk1>0.

Assumption 2. For real estate developers, the cost per unit to construct conventional housing is Ck1, while the cost per unit to build low-carbon housing is Ck2, and Ck2>Ck1>0.

Assumption 3. There are two distinct groups of consumers on the market; one prefers to purchase conventional houses, and the other prefers low-carbon houses. Low-carbon housing has a utility value of M2, whereas conventional housing has a utility value of M1.

In this study, we categorize consumers in the market into two distinct groups: those who prefer to purchase traditional houses and those who prefer to purchase low-carbon houses. This binary classification is based on extensive empirical research and theoretical support.

Firstly, empirical studies have shown that consumer preferences for houses can be effectively divided into two major categories based on their environmental consciousness. For instance, the research by Vazquez and Hallack (2024) has found that consumers can be divided into a group that prioritizes environmental sustainability and a group that prioritizes traditional house attributes. This market segmentation is supported across various industries, including the housing sector, indicating that there are indeed significant preference differences among consumers when choosing houses.

Secondly, this classification reflects the different values and preferences for environmental sustainability among different consumer groups. Consumers who prefer low-carbon houses typically place greater emphasis on environmental benefits, energy efficiency, and long-term cost savings, while those who prefer traditional houses may prioritize other factors such as initial costs, location, and design (Du et al., 2023; Wang et al., 2023).

Moreover, research in behavioral economics has shown that consumers often rely on heuristic methods and bounded rationality in the decision-making process (Li et al., 2023; Zhang et al., 2023). This binary classification simplifies the decision-making process by focusing on the two main motives driving house selection—environmental sustainability and traditional preferences. This simplification not only makes the analysis more feasible but also captures the main differences in consumer behavior, thereby providing more targeted policy recommendations.

Assumption 4. The government’s low-carbon subsidies to property developers do not exceed the additional cost of low-carbon housing, and the subsidies to house buyers do not exceed the premium for low-carbon housing.

Assumption 5. The market demand for low-carbon housing depends on consumer surplus.

2.1.1 Government subsidies

The total subsidy provided by the government to real estate developers is given in Equation 1.

w1=εcccn(1)

Where w1 represents the total quantity of government aid given to developers of real estate, and ε represents the subsidy coefficient.

Price subsidies and other types of subsidies are the two ways the government supports customers. Equation 2 gives the subsidy formula.

w2=a1+a2(2)

Where w2 represents the total quantity of government subsidy given to house buyers, a1 the price subsidy, and a2 the purchase tax subsidy.

2.1.2 Carbon tax

The government sets guidelines for low-carbon housing. Low-carbon housing is that which complies with the guidelines and ordinary housing is that which does not. The carbon tax rate is T.

2.1.3 Consumer surplus

The purchase strategy of house buyers has a certain degree of randomness, and it is not easy to gauge the true utility worth of housing purchases. This paper discusses consumer excess. The consumer surplus function introduced in this paper are shown as Equations 3, 4.

Mcc=μcηcτcpc(3)
Mnn=μnηnτnpn(4)

Whereas Mcc stands for the surplus of consumers who buy low-carbon residential units per unit area, Mnn for the surplus of consumers who buy low-carbon housing per unit area, μc for the preference coefficient of house buyers for low-carbon living, and μn for the non-preference coefficient of house buyers for low-carbon living; ηc stands for the utility value of low-carbon housing, ηn B for the utility value of normal houses, where ηc>ηn; τc for the price sensitivity of buyers who favour low-carbon housing; and τn for the price sensitivity of buyers who favour ordinary houses.

2.2 Model construction and analysis under subsidy scenarios

A game payment matrix is created, as shown in Table 1, assuming that the government offers low-carbon subsidies to both homebuyers and real estate developers.

Table 1
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Table 1. Game Payment Matrix (Low carbon subsidies).

If at time t, y represents the percentage of real estate developers who build low-carbon housing and 1y represents the percentage of real estate developers who build ordinary housing, then z represents the percentage of buyers who buy low-carbon housing and 1z represents the percentage of buyers who buy ordinary housing. The following can be ascertained in light of the game payment matrix:

The profits made by real estate developers from building low-carbon housing is Fd2=1zcc+w1+zpccc+w1. The profits made by real estate developers from building ordinary housing is Fd1=zcn+1zpncn. The average profits of real estate developers is Fd¯=1yFd1+yFd2. The replication dynamic equation is given in Equation 5.

dydt=yFd2Fd¯=y1ycc+w1pn+cn+zpc+pn(5)

The profits of house buyers purchasing low-carbon housing is Fg2=yMcc, while the profits from purchasing ordinary housing is Fg1=1yMmm, and the average income is Fg¯=1zFg1+zFg2. The replication dynamic equation is:

dzdt=zFg2Fd¯=z1zyMccMnn+yMnn(6)

A continuous evolution process termed an evolutionary game is one in which organizations gain knowledge from one another. Changes are made to the replication dynamic equations of real estate developers and house buyers because 0<y<1, 0<z<1, and 1y and 1z do not significantly alter the group’s evolutionary behavior. The modified replication dynamic equation are given as Equations 7, 8:

dy=ycc+w1pn+cn+zpc+pndt(7)
dz=z1zyMccMnn+yMnndt(8)

In reality, the strategies employed by homebuyers and real estate developers are fraught with uncertainty. On the one hand, the dynamic evolution of the complex system involving homebuyers and real estate developers remains to be fully understood. Both homebuyers and real estate developers utilize a variety of strategies, which are significantly influenced by uncertain factors such as risk, policy, and expected income. On the other hand, factors like income levels, environmental awareness, and societal perceptions of low-carbon housing substantially impact the behavior of homebuyers. Moreover, moral hazards and psychological shifts may affect the decision-making of both real estate developers and homebuyers due to their shared speculative psychology. Consequently, uncertainty also characterizes the evolutionary process of the behavior of real estate developers and homebuyers.

To address the inherent uncertainty in the decision-making processes of real estate developers and homebuyers, we introduced a stochastic element into the evolutionary game model. This stochastic element is incorporated into the replicator dynamics equations for real estate developers and homebuyers in the form of Gaussian white noise. The specific form of the stochastic element is described as follows:

Noise Type: We employ Gaussian white noise to simulate stochastic disturbances. Gaussian white noise is a widely accepted method for simulating random fluctuations in dynamic systems, characterized by a mean of zero and a constant power spectral density.

Distribution Assumption: It is assumed that the Gaussian white noise follows a normal distribution with a mean of zero. This assumption is based on the central limit theorem, which states that the sum of a large number of independent random variables will tend toward a normal distribution, regardless of the distribution of the individual variables.

Intensity Setting: The intensity of the noise is denoted by σ, which reflects the magnitude of the stochastic disturbances.

The modified replicator dynamics equations incorporating Gaussian white noise are presented in Equations 9, 10.

dyt=ytcc+w1pn+cn+ztpc+pndt+σytdωt(9)
dzt=ztytMccMnn+ytMnndt+σytdωt(10)

The standard one-dimensional Brownian motion, an irregular motion representing how the game subject changes in response to outside interference, is followed by ωt among them. The Gaussian white noise symbol is dωt. The increment Δωt=ωt+hωt follows a normal distribution N0,h when t>0 and step size h>0; σ is a normal number showing the magnitude of the random disturbance.

Lemma: For stochastic differential equations:

dxt=ft,xtdt+gt,xtdωt,xt0x0

If Vt,xC1,2R+×Rd and the constants c1 and c2 (both c1 and c2 are positive) exist and to achieve c1xpVt,xc2xp, then there is:

1. If the constant λ (λ>0), make LVt,xγVt,x, then the zero solution P moment of the above stochastic differential equation is exponentially stable, and Ext,xpc2/c1x0peγt holds.

2. If the constant λλ>0, make LVt,xγVt,x, then the zero solution P moment of the above stochastic differential equation is exponentially instability, and Ext,x0pc2/c1x0peγt holds.

The following inferences can be made based on the aforementioned lemmas, and the evolutionary stability of real estate developer’ and house buyers’ strategies can be assessed.

Proposition 1. For Equation 3, if Vt,xt=λt, λt0,1, c1=c2=1, γ=1, p=1, then: 1) ztcncc+pn1w1pc+pn and cncc+pn1w1pc+pn0 is the requirement for the exponential stability of the zero solution moment; 2) zt1+cncc+pnw1pc+pn and 1+cncc+pnw1pc+pn0 is the requirement for the exponential unstability of the zero solution moment.

Proof 1:

Since c1=c2=1, γ=1, p=1, there is ytw1pn+ztpc+pn+cccnyt. When the zero instant of solution of Equation 9 is exponentially stable. Since yt0,1, so w1pn+cccn+ztpc+pn+10, ztcncc+pn1w1pc+pn and cncc+pn1w1pc+pn0. Therefore, The zero moment exponential stability condition of Equation 3 must satisfy ztcncc+pn1w1pc+pn and cncc+pn1w1pc+pn0.

When the zero instant of solution of Equation 9 is exponentially unstable, there is ytw1pn+ztpc+pn+cccnyt. Since yt0,1, so w1pn+cccn+ztpc+pn1, ztcncc+pn1w1pc+pn and cncc+pn1w1pc+pn0. Therefore, The zero moment exponential unstability condition of Equation 3 must satisfy zt1+cncc+pnw1pc+pn and 1+cncc+pnw1pc+pn0.

This suggests that when the percentage of house buyers choosing low-carbon housing meets ztcncc+pn1w1pc+pn and cncc+pn1w1pc+pn0, real estate developers will ultimately decide to construct ordinary housing. Property developers are more likely to construct low-carbon housing when zt1+cncc+pnw1pc+pn and 1+cncc+pnw1pc+pn0.

Therefore, actively promoting low-carbon consciousness among house buyers during the early phases of low-carbon subsidies plays a positive guiding role in developing low-carbon housing strategies for real estate developers.

Proposition 2. For Equation 3, if Vt,xt=λt, λt0,1, c1=c2=1, γ=1, p=1, then: 1) ytMnn1Mnn+Mcc and Mnn1Mnn+Mcc0 is the requirement for the exponential stability of the zero solution moment; 2) ytMnn+1Mnn+Mcc and Mnn+1Mnn+Mcc0 is the requirement for the exponential unstability of the zero solution moment.

The proof process for Proposition 2 is similar to Proposition 1.

This suggests that when the proportion of low-carbon residential buildings reaches ytMnn1Mnn+Mcc and Mnn1Mnn+Mcc0, house buyers will eventually opt to buy ordinary houses. House buyers are more likely to choose low-carbon housing when ytMnn1Mnn+Mcc and Mnn1Mnn+Mcc0. This finding, therefore, provides a theoretical foundation for encouraging the diffusion of low-carbon housing and aids the government in developing subsidy measures to direct the low-carbon behavior of real estate developers.

In conclusion, three circumstances can be used to categorize the development of low-carbon behavior among property developers and house buyers:

1. When the proportion of real estate developers and homebuyers who use low-carbon strategies equals zcncc+pn1w1pc+pn and yMnn1Mnn+Mcc, the system will ultimately evolve to ESS (0,0), which means that neither homebuyers nor real estate developers will use low-carbon strategies. In this scenario, government low-carbon subsidies cannot effectively motivate real estate developers and homebuyers to adopt low-carbon strategies.

2. Homebuyers and real estate developers will adopt low-carbon strategies as a result of the incentive provided by real estate subsidies when zt1+cncc+pnw1pc+pn and ytMnn+1Mnn+Mcc, which will eventually cause the system to evolve towards ESS (1,1).

3. The system’s direction of evolution is ambiguous when cncc+pn1w1pc+pnzt1+cncc+pnw1pc+pn, Mnn1Mnn+MUccytMnn+1Mnn+Mcc. Under the influence of noise, real estate developers and house buyers’ strategies might change in the direction of (1,1) or (0,0), i.e., developers might build low-carbon houses or other types of houses, and buyers might choose to buy low-carbon houses or other types of houses. The evolutionary system is currently in a state of chaos.

Figure 1 displays the regional distribution of the three circumstances.

Figure 1
Graph depicting a chaotic region in red, surrounded by stable yellow regions labeled

Figure 1. The regional distribution of the three circumstances (Carbon subsidies).

2.3 Model construction and analysis under the carbon tax scenario

Table 2 displays the game payment matrix for the carbon tax situation.

Table 2
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Table 2. Game payment matrix (carbon tax).

The profits made by real estate developers from building low-carbon housing is Fd2=cc1z+zpccc. The profits made by real estate developers from building ordinary housing is Fd1=zcnT+1zpncnT. The average profits of real estate developers is Fd¯=1yFd1+yFd2. The replication dynamic equation is given in Equation 11:

dydt=yFd2Fd¯=y1yTcc+cn+pcz+pnzpn(11)

The profits of house buyers purchasing low-carbon housing is Fg2=yMcc, while the profits from purchasing ordinary housing is Fg1=1yMmm, and the average income is Fg¯=1zFg1+zFg2. The replication dynamic equation is the same as Equation 6.

The modified replication dynamic equation is given in Equation 12:

dy=yTcc+cn+pcz+pnzpndt(12)

Proposition 3. For Equation 3, if Vt,xt=λt, λt0,1, c1=c2=1, γ=1, p=1, then: 1) zt1T+cccn+pnpc+pn and 1T+cccn+pnpc+pn0 is the requirement for the exponential stability of the zero solution moment; 2) zt1T+cccn+pnpc+pn and 1T+cccn+pnpc+pn0 is the requirement for the exponential unstability of the zero solution moment.

The proof process for Proposition 3 is similar to Proposition 1.

The evolution of low-carbon behavior among real estate developers and homebuyers under carbon taxes can also be split into three categories, similar to low-carbon subsidies:

1. When the proportion of real estate developers and homebuyers who use low-carbon strategies equals zt1T+cccn+pnpc+pn and ytMnn1Mnn+Mcc, the system will ultimately evolve to ESS (0,0), which means that neither homebuyers nor real estate developers will use low-carbon strategies. In this scenario, government low-carbon subsidies cannot effectively motivate real estate developers and homebuyers to adopt low-carbon strategies.

2. Homebuyers and real estate developers will adopt low-carbon strategies as a result of the incentive provided by real estate subsidies when zt1T+cccn+pnpc+pn and ytMnn+1Mnn+Mcc, which will eventually cause the system to evolve towards ESS (1,1).

3. The system’s direction of evolution is ambiguous when 1T+cccn+pnpc+pnzt1T+cccn+pnpc+pn or Mnn1Mnn+MccytMnn+1Mnn+Mcc. Under the influence of noise, real estate developers and house buyers’ strategies might change in the direction of (1,1) or (0,0), i.e., developers might build low-carbon houses or other types of houses, and buyers might choose to buy low-carbon houses or other types of houses. The evolutionary system is currently in a state of chaos.

Figure 2 displays the regional distribution of the three circumstances under the carbon tax.

Figure 2
Graph showing a chaotic region in pink, bordered by two equilibrium stable states (ESS) in yellow: ESS (0, 0) in the bottom left and ESS (1, 1) in the top right. Axes are labeled \(z(t)\) and \(y(t)\). Formulae are provided on each axis, representing boundary conditions.

Figure 2. The regional distribution of the three circumstances (Carbon tax).

3 Simulation

The average selling price of business real estate in China in 2022 was 9,860 yuan/m2, and the profit for ordinary housing was 986 yuan/m2. Low-carbon housing may generate lesser earnings than conventional housing due to the rising costs and high selling price of such housing. Considering that the earnings of low-carbon housing are 5% less than that of ordinary housing, this comes to 936 yuan/m2.

Although carbon tax policies have been implemented in 29 countries and regions worldwide, China has not yet implemented a carbon tax. European countries with higher tax rates, such as Sweden’s carbon tax of $127/tCO2e. On the other hand, carbon taxes in developing countries are generally low, ranging from $4/tCO2e to $8/tCO2e. Based on the carbon tax rates of developing countries, China’s initial carbon tax rate was set at 40 yuan ($6.3). Because the carbon emissions of residential buildings in northern China are 2.25tCO2/m2 over their entire life cycle, the carbon tax can be set at 110 yuan/m2 (Yao et al., 2023a). Therefore, the relevant parameters are set to: pn=9860, pc=10700, cn=8874, cc=9764, w1=100, w2=100. The following parameters were chosen based on the literature (Zheng and Yu, 2022): ηc=50, ηn=40, τc=1, τn=1, σc=0.3, σn=0.4.

3.1 Evolutionary game simulation under subsidies

The following are the three evolutionary scenarios for implementing low-carbon subsidies on low-carbon housing:

Scenario 1: y0.38 and z0.48

Scenario 2: y0.49 and z0.68

Scenario 3: 0.38<y<0.49 or 0.48<z<0.68

MATLAB was used to simulate the implementation effect of low-carbon housing to validate the three evolutionary scenarios of implementing low-carbon subsidies on low-carbon housing in noisy environments. Two noise environments have been set: σ=2 dB and σ=10 dB.

3.1.1 Scenario 1

In this case, the replicated state equation’s initial solutions are as follows: y0=0.3, z0=0.4; y0=0.1, z0=0.3 and y0=0.2, z0=0.2. Figures 3, 4 depict evolutionary game simulation diagrams obtained under the influence of noise.

Figure 3
A line graph displaying various data series depicting values over time. The graph includes six lines with different colors and styles, each representing different conditions of \( y_0 \), \( z_0 \), and noise levels. The x-axis is labeled as \( T \) and the y-axis as \( \gamma \). A legend on the right correlates lines with specific \( y_0 \), \( z_0 \), and noise values.

Figure 3. Evolution trend of real estate developers’ strategies in the context of low-carbon subsidies (Scenario 1).

Figure 4
Line graph displaying six datasets with varying noise levels over time. Each dataset is represented with distinct colors and markers, indicated in the legend. The x-axis is labeled

Figure 4. Evolution trend of homebuyers’ strategies in the context of low-carbon subsidies (Scenario 1).

Through the above simulation, it can be concluded that under the condition of y0.38 and z0.48, even under the interference of noise, the low-carbon strategies of real estate developers and homebuyers both evolve towards 0; that is, the homebuyer’s strategy is not enough to buy low-carbon housing, while the real estate developer’s strategy evolves to build ordinary housing.

3.1.2 Scenario 2

In this case, the replicated state equation’s initial solutions are as follows: y0=0.5, z0=0.7; y0=0.6, z0=0.8 and y0=0.7, z0=0.7. Figures 5, 6 depict evolutionary game simulation diagrams obtained under the influence of noise.

Figure 5
Line graph depicting various simulations of gamma (γ) over time (T) from zero to six. Six lines, each with different initial conditions and noise levels, approach or reach gamma equals one. The legend specifies the parameters for each line with colors and star or asterisk markers.

Figure 5. Evolution trend of real estate developers’ strategies in the context of low-carbon subsidies (Scenario 2).

Figure 6
Line graph showing multiple data series labeled by initial conditions and noise levels. The x-axis represents

Figure 6. Evolution trend of homebuyers’ strategies in the context of low-carbon subsidies (Scenario 2).

Through the above simulation, it can be concluded that under the condition of y0.49 and z0.68, even under the interference of noise, the low-carbon strategies of real estate developers and homebuyers both evolve towards 1; that is, homebuyers’ strategies evolved into purchasing low-carbon housing, while real estate developers’ strategies evolved into building low-carbon housing.

3.1.3 Scenario 3

In this case, the replicated state equation’s initial solutions are as follows: y0=0.2, z0=0.8; y0=0.4, z0=0.6 and y0=0.8, z0=0.2. Figures 7, 8 depict evolutionary game simulation diagrams obtained under the influence of noise.

Figure 7
Line graph showing variable \( \gamma \) on the vertical axis from 0.0 to 1.0, plotted over time \( T \) from 0 to 6 on the horizontal axis. The graph includes six lines in different colors and styles: green, blue dashed, black, orange, magenta, and red, representing different \( y_0 \), \( z_0 \), and noise conditions as labeled in the legend. The graph displays various fluctuations for each condition.

Figure 7. Evolution trend of real estate developers’ strategies in the context of low-carbon subsidies (Scenario 3).

Figure 8
Line graph showing multiple data series with different noise levels and initial values. The y-axis is labeled \( z \) ranging from 0.0 to 1.0, and the x-axis is labeled \( T_3 \) ranging from 0 to 6. Each line represents a series with specific initial conditions and noise, detailed in the legend: green, blue dashed, black, orange, pink, and red lines correspond to different \( y_0, z_0, \) and noise values.

Figure 8. Evolution trend of homebuyers’ strategies in the context of low-carbon subsidies (Scenario 3).

The above simulation leads to the conclusion that when 0.38y0.49 and 0.48z0.68, real estate developers and homebuyers’ strategies are unstable. Noise causes real estate developers’ and homebuyers’ strategies to fluctuate more, resulting in a chaotic market. Their strategies may evolve in the direction of (0,0) or the direction of (1,1).

The three low-carbon subsidy scenarios for the development and evolution of low-carbon housing have been proven.

3.2 Evolutionary game simulation under carbon taxes

The following are the three evolutionary scenarios for implementing carbon taxes on low-carbon housing:

Scenario 1: y0.45 and z0.48

Scenario 2: y0.49 and z0.68

Scenario 3: 0.38<y<0.49 or 0.48<z<0.68

3.2.1 Scenario 1

In this case, the replicated state equation’s initial solutions are as follows: y0=0.3, z0=0.4; y0=0.1, z0=0.4 and y0=0.2, z0=0.3. Figures 9, 10 depict evolutionary game simulation diagrams obtained under the influence of noise.

Figure 9
Line graph showing multiple overlapping plots with varying line styles and colors, representing different conditions: initial values \(y_0\) and \(z_0\) and noise levels. Legend on the right details specific parameters for each line, such as \(y_0 = 0.3, z_0 = 0.4\) with noise \(2\) and \(10\). \(y\)-axis ranges from 0 to 0.6, and \(T\)-axis ranges from 0 to 6.

Figure 9. Evolution trend of real estate developers’ strategies in the context of carbon tax (Scenario 1).

Figure 10
Line graph depicting various datasets with different initial conditions and noise levels, as indicated in the legend. The x-axis represents time (T) from 0 to 6, and the y-axis represents variable (Z) from 0 to 0.6. Different colored lines show the data trends, with fluctuations varying by noise level and initial conditions.

Figure 10. Evolution trend of homebuyers’ strategies in the context of carbon tax (Scenario 1).

Through the above simulation, it can be concluded that under the condition of y0.45 and z0.48, even under the interference of noise, the low-carbon strategies of real estate developers and homebuyers evolve towards 0; that is, the homebuyer’s strategy is not enough to buy low-carbon housing, while the real estate developer’s strategy evolves to build ordinary housing.

3.2.2 Scenario 2

In this case, the replicated state equation’s initial solutions are as follows: y0=0.70, z0=0.80; y0=0.56, z0=0.68 and y0=0.65, z0=0.70. Figures 11, 12 depict evolutionary game simulation diagrams obtained under the influence of noise.

Figure 11
Line graph showing multiple datasets with different noise levels. The y-axis is labeled

Figure 11. Evolution trend of real estate developers’ strategies under the carbon tax scenario (Scenario 2).

Figure 12
A line graph depicts the relationship between T (x-axis) and Z (y-axis), displaying multiple lines for different conditions. Each line represents varying initial values \(y_0\), \(z_0\), and noise levels, as indicated in the legend. Lines are colored green, blue, red, cyan, magenta, and orange, showing fluctuations in Z as T increases. The graph highlights data convergence around Z equals 0.9 to 1.0.

Figure 12. Evolution trend of homebuyers’ strategies under the carbon tax scenario (Scenario 2).

The above simulation shows that when y0.56 and z0.68, even with noise interference, real estate developers’ and homebuyers’ low-carbon strategies both evolve towards 1, that is, the homebuyer’s strategy evolves to buy low-carbon housing, and the real estate developer’s strategy evolves to build low-carbon housing. This means that, if y0.56 and z0.68, carbon tax policies can effectively encourage the implementation of low-carbon housing.

3.2.3 Scenario 3

In this case, the replicated state equation’s initial solutions are as follows: y0=0.2, z0=0.7; y0=0.5, z0=0.5 and y0=0.8, z0=0.4. Figures 13, 14 depict evolutionary game simulation diagrams obtained under the influence of noise.

Figure 13
Line chart displaying the variable γ over time T with six different line styles representing various combinations of y₀, z₀, and noise levels. The legend indicates specific parameters for each line style, such as blue dashed for y₀=0.2, z₀=0.7, noise=10 and green for y₀=0.8, z₀=0.4, noise=10. Lines show diverse fluctuations and trends across the time axis.

Figure 13. Evolution trend of real estate developers’ strategies under the carbon tax scenario (Scenario 3).

Figure 14
Line graph showing multiple fluctuating data series labeled by initial values \( y_0 \), \( z_0 \), and noise levels. The graph tracks variable \( z \) over time \( T \). Each line represents different parameter combinations, such as blue dashed for \( y_0 = 0.2 \), \( z_0 = 0.7 \), with noise \( 10 \), and others vary in color and line style. Data ranges from \( 0 \) to \( 1 \) on the vertical axis for \( z \), and \( 0 \) to \( 6 \) on the horizontal axis for \( T \).

Figure 14. Evolution trend of homebuyers’ strategies under the carbon tax scenario (Scenario 3).

It is clear from the simulation above that, when 0.38<y<0.49 and 0.48<z<0.68, real estate developers’ and homebuyers’ strategies are unstable due to the impact of the carbon tax. The tactics of real estate developers and homebuyers fluctuate more as a result of noise, and the market is in a chaotic condition. Their tactics could develop in either the direction of (0, 0) or (1, 1).

The three carbon taxes scenarios for the development and evolution of low-carbon housing have been proven.

4 Conclusion

We assessed the efficacy of carbon taxes and subsidies in fostering low-carbon housing development by juxtaposing these two environmental policies against carbon trading policies. To examine the impacts of carbon taxes and subsidies on the proliferation of low-carbon housing, stochastic evolutionary game models were constructed and analyzed. Irrespective of whether it is a carbon tax or a subsidy, the promotion of low-carbon housing can be categorized into three distinct phases: the initial stage, the development stage, and the stable stage of low-carbon housing development under the influence of either a carbon tax or a subsidy.

4.1 The initial stage

In the context of low-carbon subsidies, when real estate developers and homebuyers embrace low-carbon strategies in proportion, zcncc+pn1w1pc+pn and yMnn1Mnn+Mcc, the implementation of low-carbon housing enters the initial phase. In the context of carbon taxes, when real estate developers and homebuyers embrace low-carbon strategies in proportion, z1T+cccn+pnpc+pn and yMnn1Mnn+Mcc, the implementation of low-carbon housing enters the initial phase. The willingness of homebuyers and real estate developers to reduce their carbon footprint is currently comparatively low, and carbon taxes or subsidy policies have little impact. In this case, the government should implement some policies, such as a carbon tax and subsidy programs concurrently, to encourage the growth of low-carbon housing to reach the development and stable stage as soon as feasible. Our model indicates that relying solely on government subsidies or carbon taxes is insufficient to effectively achieve widespread implementation of low-carbon residential buildings across various noise intensities. This finding underscores the necessity for additional policy interventions and market mechanisms to overcome initial market resistance and inertia.

4.2 The development stage

Even though homebuyers and real estate developers are more ready to adopt low-carbon strategies during the development stage, it is unclear how these groups will ultimately evolve. In the case of implementing low-carbon subsidies, when cncc+pn1w1pc+pnzt1+cncc+pnw1pc+pn or Mnn1Mnn+MccytMnn+1Mnn+Mcc, it is the development stage. In the case of implementing carbon tax, when 1T+cccn+pnpc+pnzt1T+cccn+pnpc+pn or Mnn1Mnn+MccytMnn+1Mnn+Mcc, it is the development stage. The government should actively assist homebuyers and property developers in raising the expectations of the low-carbon housing market during the development stage to promote the prosperity of the low-carbon housing market. The stochastic evolutionary game model demonstrates that minor changes in initial conditions or policy parameters can lead to significant deviations in the evolutionary trajectory. At this stage, the relationship between carbon taxes, subsidies, and the implementation of low-carbon residential buildings becomes more complex and exhibits chaotic states under certain noise intensities.

4.3 The stable stage

The role of the carbon tax and subsidy policies in promoting the development of low-carbon housing is significant as real estate developers’ and homebuyers’ readiness to adopt low-carbon practices grows. Real estate developers and house buyers are moving towards low-carbon strategies, which is a stable stage of development. The stable stage in the situation of low-carbon subsidies occurs when zt1+cncc+pnw1pc+pn and ytMnn+1Mnn+Mcc. The stable stage in the situation of carbon taxes occurs when z1T+cccn+pnpc+pn and yMnn+1Mnn+Mcc. In the stable phase, the system reaches a critical point where low-carbon residential buildings can be successfully implemented, leading to a qualitative change.

5 Limitations and future work

Although this study has thoroughly investigated the incentive mechanisms of carbon taxes and subsidies on the development of low-carbon housing, there are still some limitations. For example, the model fails to fully reveal nonlinear dynamic characteristics, such as tipping points and chaotic dynamics, which may be crucial in the actual implementation of policies. In addition, the simplification of model assumptions, such as the perfectly rational behavior of market participants, may limit the ability to explain actual market behavior. At the same time, the study has not fully considered the combined effects of carbon taxes and subsidies with other environmental policies, as well as the heterogeneity of different regions and industries.

Future research can further explore these nonlinear dynamic characteristics, integrate the theories of behavioral economics, analyze the combined effects of policy packages, and expand the scope of empirical data. These improvements will help to more comprehensively understand the impact of policies on the low-carbon housing market and provide a more scientific basis for policy-making.

Data availability statement

The original contributions presented in the study are included in the article/supplementary material, further inquiries can be directed to the corresponding authors.

Author contributions

WL: Methodology, Project administration, Supervision, Writing – original draft, Writing – review and editing, Data curation, Formal Analysis, Investigation, Visualization. JL: Conceptualization, Data curation, Formal Analysis, Software, Supervision, Validation, Visualization, Writing – original draft.

Funding

The author(s) declare that financial support was received for the research and/or publication of this article. We are grateful for the support from the Youth Talent Funding “Morning Star Program” of the Wuhan Municipal Health Commission [Wu Wei Fa (2023) No. 28].

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Generative AI statement

The author(s) declare that no Generative AI was used in the creation of this manuscript.

Any alternative text (alt text) provided alongside figures in this article has been generated by Frontiers with the support of artificial intelligence and reasonable efforts have been made to ensure accuracy, including review by the authors wherever possible. If you identify any issues, please contact us.

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Keywords: low carbon subsidies, carbon tax, low carbon housing, evolutionary game, low-carbon economy

Citation: Lv W and Li J (2025) How carbon taxes and subsidies affect the implementation of low-carbon housing? An evolutionary game theory analysis. Front. Environ. Sci. 13:1679245. doi: 10.3389/fenvs.2025.1679245

Received: 04 August 2025; Accepted: 01 September 2025;
Published: 11 September 2025.

Edited by:

Delu Wang, China University of Mining and Technology, China

Reviewed by:

Dongsheng Liao, Guangxi Minzu University, China
Chenglong Wang, Chongqing University, China

Copyright © 2025 Lv and Li. 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.

*Correspondence: Wenwen Lv, bHZ3ZW53ZW4wODRAMTYzLmNvbQ==; Jun Li, MzQ2OTk2MDUwQHFxLmNvbQ==

Disclaimer: 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.