This study examines how supply chain structure diversification drives high-quality enterprise development in the digital economy. Using panel data from Chinese listed non-financial firms (2009–2023), we find that diversification of both suppliers and customers significantly improves firms’ total factor productivity (TFP), and the results remain robust after controlling for endogeneity. Mechanism analyses show that diversification enhances innovation capability, sustainability performance, and risk resilience, while digital supply chains strengthen these effects by improving information flow and coordination. Heterogeneity tests reveal that the impact is greater for firms with higher operational efficiency, cultural synergy, and information transparency. Overall, the findings highlight that diversified and digitally integrated supply chains are essential for innovation-driven, resilient, and sustainable enterprise growth.

In recent years, more and more research has focused on the impact of corporate social responsibility (CSR) on business activities. Due to the existence of two different theoretical perspectives, shareholder value theory and managerial opportunism theory, the research on CSR has reached different conclusions. Meanwhile, the motivations for environmental investments in enterprises have received attention from scholars. However, there is a lack of empirical research on the relationship between CSR and environmental investment. Therefore, this study conducts a regression analysis on the external evaluation of CSR and enterprises’ environmental investment using data from Chinese listed companies. The empirical results show a significant positive relationship between the external evaluation of CSR and enterprises’ environmental investment. The mediating tests conducted based on information transmission and resource acquisition mechanisms explain the reasons for this promotion effect, supporting the shareholder value theory. Furthermore, our research finds that this promotion effect is more significant in non-state-owned enterprises, enterprises receiving fewer environmental subsidies, enterprises disclosing environmental philosophies, and enterprises identified as key pollution-monitoring units in reports. The research findings of this study are meaningful for clarifying the economic consequences of CSR and provide practical evidence for Chinese enterprises to understand the importance of environmental investment and the government’s advocacy for enterprises to proactively engage in environmental investment.