The role of ethics and morals in excellent leaders has been reemphasized by leadership and management theorists (George, 2003; Luthans and Avolio, 2003; May et al., 2003; Avolio and Gardner, 2005; Brown and Treviño, 2006; Hoch et al., 2018). Leader value has become an emerging topic among practitioners and academia (Newstead et al., 2021). De Hoogh and Den Hartog (2008) investigated the relationship between leaders' social responsibility and the ethical aspects of leadership, such as morality and fairness, role clarification, and power sharing. De Hoogh and Den Hartog (2008) found that leaders with high social responsibility have a high level of ethical values and ethical conduct (Banks et al., 2016; Gardner and Wickramasinghe, 2023). Value is generally used to understand the characteristics and behavior of a community or individual. Value becomes a crucial discussion in social sciences as it constitutes what is good or bad, fair, or unfair, and legitimate or illegitimate in the life of a community (Boudon, 2001; Newstead et al., 2021). Universalism is one of the value aspects of human or work values. According to Schwartz (2006), universalism is a value of understanding, appreciation, tolerance, and protection devoted to the welfare of people and nature. Universalism reflects inner harmony in everyday life, which can be found in diverse people from different parts of the world. Nevertheless, although some value leadership styles, such as ethical leadership, authentic leadership, and transformational leadership, have shown a link to desired outcomes (i.e., performance and effectiveness) (Hoch et al., 2018), how the mechanism of value links to leadership style remain scant. effectiveness) (Ng, 2017), yet few studies have investigated the link between values and transformational leadership toward desired outcomes such as innovation and leader effectiveness.

Innovation in current business is a strategic issue that becomes an essential element to survive and grow in a competitive, dynamic, and turbulent atmosphere. Zahra and Covin (1994) conducted research on 120 strategic business units and found that the differences in strategies associated with different types of innovation will ultimately affect the firm financial performance. The concept of transformational leadership was first introduced by Burns in 1978. Many decades later, the interest in this area continues to grow until now. Kuhnert and Lewis (1987) developed a two-level transformational leadership and three- stage developmental model of leadership. Previous studies have endeavored to connect transformational leadership with other aspects of the organization. Jung et al. (2003) indicated that transformational leadership was positively related to organizational empowerment and innovation climate. Peterson et al. (2009) made a comparison between start-ups and established firms. They argued that transformational leadership was more strongly connected to start-up performance than established companies. In the Asian context, Harsanto and Roelfsema (2015) found a strong effect of transformational leadership on sales growth mediated by entrepreneurial orientations. Moreover, in line with Derue et al. (2011)'s call for integration across leadership forms, the current study intends not only to comprehend but also to analyze the three ethical/moral values-based leadership forms in the context of transformational leadership (Garg and Krishnan, 2003; Copeland, 2014; Abay et al., 2023). There has been some debate about whether these morally focused leadership techniques are conceptually separate from transformative leadership (e.g., Avolio and Gardner, 2005).

Extant research has provided some empirical evidence of significant associations between transformational leadership and ethical (Ng and Feldman, 2015), authentic (Riggio et al., 2010), and servant leadership (Van Dierendonck et al., 2014). Prior studies examining the link between ethical value, leadership, and business performance have been studied by several scholars (Siangchokyoo et al., 2020). However, how human or work value is linked to leadership style, innovativeness, and effectiveness is rarely elaborated (Li et al., 2016; Cho and Kao, 2022). Thus, this paper aims to examine the relationship between universalism, transformational leadership, innovativeness, and leader effectiveness in the context of SMEs in Indonesia, which has the largest population and economy in Southeast Asia.

This study provides one-of-a-kind primary survey-based data to comprehend the association of organizational factors (viz. leader value, leadership style) and contextual factors (viz. universalism, transformational leadership, and leader effectiveness) on SMEs' innovation in Indonesia. Most previous studies on transformational leadership style have only focused on the consequences of transformational leadership style, such as job performance and work engagement. Therefore, this study investigates not only the consequences of transformational leadership but also the human or work value factor (i.e., universalism) as an antecedent of transformational leadership, which is extremely rare in the literature on transformational leadership (Jin et al., 2016; Lin et al., 2022; Shamshad and Naqi Khan, 2022). These data, which include information on universalism, leadership, innovation, and leader effectiveness, can be helpful for researchers researching antecedents of value-based leadership and innovation as well as leader effectiveness. Moreover, the findings from this data can also be of practical use for the SMEs and policymakers in leadership development of the owners or senior management of SMEs to enhance their leadership effectiveness. The data can be used for advanced level modeling such as mediation, moderation, and moderated mediation because they are metric/quantitative in nature and have been collected using reflecting scales (Ng, 2017).

Furthermore, this study contributes to the existing body of knowledge in leadership and organizational studies in three significant ways. Firstly, it establishes a novel connection between value-based leadership and innovation within a unified model, a gap that has been inadequately addressed in the literature (Snyder et al., 2017; Hunsaker, 2022). The absence of a simultaneous examination of transformational leadership and innovativeness as subsequent mediators leaves our understanding of the impact of value-based leadership, particularly in terms of universalism, on leader effectiveness unclear. As a result, managerial initiatives aimed at cultivating effective leadership may be rendered unjustifiable if not grounded in a comprehensive assessment. For instance, leaders seeking to enhance their effectiveness may inadvertently focus solely on fostering innovativeness without considering the crucial elements of inspiring motivation and individualized consideration associated with transformational leadership.

Secondly, this study enriches the literature by shedding light on the antecedents of transformational leadership, an aspect that has received relatively limited attention (Morf and Bakker, 2022). While prior research has predominantly explored the direct effects of transformational leadership on desired outcomes (Hoch et al., 2018), the investigation into how a leader's values interact with leadership styles to ultimately influence leader effectiveness has been understudied. Despite literature acknowledging that certain leadership styles cultivate innovativeness and leader effectiveness, this study adopts a social exchange lens. It highlights how a leader's values, specifically universalism, justify the emergence of innovativeness and contribute to the perception of leader effectiveness.

Thirdly, by integrating value-based leadership with the social exchange theory, this study enhances our comprehension of leader effectiveness. It provides a more comprehensive explanation of how a leader's values, in conjunction with social exchange dynamics, contribute to the overall effectiveness of leadership in an organizational context.

The study highlights the importance of universalism leadership toward leader effectiveness. Organizations should promote universalism value among leaders and provide training and development programs in order to cultivate transformational leadership skills. Transformational leadership may be deemed insufficient due to the absence of a strong, explicit moral dimension (Hoch et al., 2018). Thus, to stimulate innovativeness and leader effectiveness, leaders not only should apply transformational leadership style but also embrace universalism. Universalism values, such as understanding, appreciation, tolerance, and protection of people and nature, should be developed into transformational leadership style. Transformational leaders should encourage a sense of social responsibility and promote inclusivity, diversity, and sustainability within their organizations. By flourishing universalism values, organizations can benefit innovativeness and leader effectiveness. Organizations should identify and develop transformational leaders who inspire and motivate their teams, stimulate intellectual curiosity, and provide individualized support. By nurturing transformational leadership, organizations not only can drive innovation yet ultimately will see as effective leader.

Innovation is crucial for organizational survival and growth. Therefore, organizations should create a supportive environment that encourages and rewards innovation. Leaders should promote a culture of continuous learning, experimentation, and risk-taking. By fostering a climate that values and supports innovation, organizations can stay competitive and adapt to changing market dynamics.

Future research could explore the mediating mechanisms through which universalism values influence transformational leadership and its outcomes (Ng, 2017). This could provide a deeper understanding of the underlying processes and shed light on the specific pathways through which values impact leadership effectiveness and innovation. Moderation analysis: Investigating potential moderators of the relationships between universalism, transformational leadership, and outcomes could offer valuable insights. Factors such as organizational culture, industry context, or individual characteristics may moderate the relationships, and exploring these interactions can provide a more nuanced understanding of the dynamics at play. Longitudinal studies: Conducting longitudinal studies would allow for the examination of the causal relationships between universalism values, transformational leadership, innovation, and leader effectiveness over time. Longitudinal designs can provide more robust evidence and capture the dynamic nature of these constructs. Cross-cultural studies: Replicating the study in different cultural contexts would contribute to our understanding of how universalism values and transformational leadership operate across diverse cultural settings. Comparing the findings across cultures can reveal cultural nuances and identify potential boundary conditions for the relationships studied. Mixed-methods approaches: Combining quantitative surveys with qualitative methods, such as interviews or case studies, can provide richer insights into the experiences and perceptions of leaders and employees. Moreover, scholars must also evaluate and refine key assumptions along the way to new paradigm consensus. Therefore, mixed- methodologies are most suited to this task. Mixed-method research concentrating on follower transformation, for example, might evaluate potential mediators found through inductive investigations, combining traditional quantitative approaches to hypothesis testing with qualitative interviews to open the black box of follower transformation (Siangchokyoo et al., 2020). This mixed-methods approach would help capture the complexity of the relationships and offer a more comprehensive understanding of the phenomenon under investigation.

The integration of various and applicable theories to assist explain previously or currently inexplicable phenomena and organize theoretical predictions is a feature of these types of investigations (intermediate studies; Edmondson and McManus, 2007). To explain why transformational leader behaviors result in positive follower psychological changes, scholars have previously recommended theories such as social learning theory (Bandura, 1977), social exchange theory (Graen and Uhl-Bien, 1995), and social identity theory (Ashforth and Mael, 1989). Moreover, opens up possibilities for using other existing ideas to further demonstrate how leaders impact followers such as self-regulation theory (Lord et al., 2010) and theories about emotions (e.g., affective events theory; Weiss and Cropanzano, 1996; event system theory; Morgeson et al., 2015).

In addition, future research might be explored most particularly, authentic leadership and servant leadership (Siangchokyoo et al., 2020). For intance, how value-based leadership or work values link to authentic leadership and servant leadership which results to innovative behavior of the follower and the effectiveness of these type of leadership.

The data that support the findings of this study are available from the corresponding author, [SW], upon reasonable request.

The studies involving humans were approved by the Committee of Ethics of Padjadjaran University. The studies were conducted in accordance with the local legislation and institutional requirements. The participants provided their written informed consent to participate in this study. Written informed consent was obtained from the individual(s) for the publication of any potentially identifiable images or data included in this article.

All authors listed have made a substantial, direct, and intellectual contribution to the work and approved it for publication.