Author: Dr. Gariba et al. (2026)
The transition toward a circular economy (CE) has become a central objective of sustainable development strategies worldwide as governments seek to reduce resource depletion, minimize waste generation, and enhance long-term environmental sustainability. Among the policy instruments designed to accelerate this transition, green finance (GF) has emerged as a critical mechanism for mobilizing capital toward environmentally responsible investments and circular business practices. Through green bonds, sustainable loans, environmental investment funds, and other financing instruments, GF can support resource efficiency, waste reduction, recycling activities, and clean technologies that are essential for circular economic systems. Despite its growing importance, empirical evidence regarding the effectiveness of GF in promoting the circular economy remains inconclusive. Existing studies often assume a direct and universally positive relationship between GF and CE outcomes, overlooking the institutional, technological, and socio-cultural conditions that may shape this relationship. Consequently, limited understanding exists regarding why GF generates stronger circular economy outcomes in some countries than in others.
To address this gap, this study develops a comprehensive analytical framework that integrates Neo-Institutional Theory, Green Multi-Stakeholder Theory, Innovation Diffusion Theory, and the Technology–Organization–Environment (TOE) framework. By combining these complementary theoretical perspectives, the study examines not only the direct impact of GF on CE investments but also the mediating and moderating roles of cultural diversity, technological innovation, and digitalization. This integrated approach enables a deeper understanding of the contextual factors that influence the effectiveness of green finance in supporting circular economy development.
The analysis utilizes a panel dataset covering OECD countries from 2014 to 2023. Fixed-effects regression models are employed to account for unobserved country-specific heterogeneity and to provide robust estimates of the relationships among the study variables. In addition, moderated-mediation analysis is conducted to capture the complex pathways through which green finance influences circular economy outcomes across different institutional and technological environments.
The findings reveal a generally positive association between green finance and circular economy investments across OECD countries, suggesting that greater availability of green financial resources contributes to the expansion of circular economic activities. However, the results also demonstrate that this relationship is considerably more nuanced than commonly assumed. Technological innovation and digitalization significantly moderate the GF–CE nexus, indicating that the effectiveness of green finance depends on a country’s technological readiness and digital capabilities. Countries with stronger technological ecosystems are better positioned to convert green financial resources into circular economy investments and outcomes.
The mediation analysis further highlights the importance of digital transformation. Among the examined mediators, digitalization exerts a significant positive mediating effect, suggesting that digital technologies facilitate the efficient allocation, monitoring, and implementation of green investments that support circular economic activities. In contrast, technological innovation does not exhibit a significant mediating role despite its moderating influence, indicating that innovation primarily strengthens the conditions under which green finance becomes effective rather than directly transmitting its effects.
An equally important finding concerns the role of cultural diversity. The results reveal a dual and previously underexplored effect. Cultural diversity positively mediates the relationship between green finance and circular economy investments, suggesting that diverse societies may encourage broader stakeholder engagement, knowledge exchange, and innovative approaches to sustainability challenges. However, cultural diversity negatively moderates the GF–CE relationship, implying that higher levels of diversity may also create coordination challenges, institutional complexity, or differences in environmental priorities that weaken the effectiveness of green finance initiatives. This dual effect helps explain the mixed findings reported in previous studies and demonstrates that socio-cultural contexts play a critical role in shaping sustainability outcomes.
The subgroup analysis generates another important insight. In OECD countries that have already achieved relatively high levels of circular economy development, additional green finance may produce diminishing or even negative marginal returns. The findings suggest that excessive reliance on financial support can potentially crowd out technological innovation or reduce incentives for further efficiency improvements. This result challenges the prevailing assumption that increasing green finance will always enhance circular economy performance and highlights the need for more balanced and context-sensitive policy approaches.
This study makes several important contributions to the literature. First, it advances green finance and circular economy research by integrating four complementary theoretical perspectives into a unified framework. Second, it introduces a moderated-mediation perspective that uncovers the complex mechanisms through which institutional, technological, and cultural factors shape the GF–CE relationship. Third, it identifies the heterogeneous effects of green finance across countries at different stages of circular economy development, providing an explanation for inconsistent findings in prior studies. From a policy perspective, the findings suggest that green finance should not be implemented as a standalone instrument. Instead, policymakers should align financial initiatives with digital transformation strategies, technological capabilities, and country-specific cultural conditions to maximize circular economy outcomes and ensure the long-term effectiveness of sustainable development policies.
Read the full article here to explore the detailed findings and their implications for both policymakers and practitioners.