"以购促治"视角下政府绿色采购的碳减排效应与影响路径OA

Government green procurement,as an important demand-side policy instrument for achieving environmental governance ob-jectives,has become a key issue in green development research regarding how it can balance"stabilizing growth"and"promoting emis-sion reduction."Based on matched data between Chinese listed firms and government green procurement projects from 2015 to 2022,this study exploited the relatively exogenous shock of firms'first-time receipt of government green procurement contracts and construct-ed a staggered difference-in-differences(DID)model to systematically identify the impact of government green procurement on firm car-bon emissions.From the dual perspectives of endogenous drivers and institutional constraints,the study further uncovered the underly-ing transmission mechanisms and functional boundaries of"purchasing for governance."The main findings were as follows:(1)After firms obtained government green procurement contracts for the first time,their carbon emission intensity decreased significantly,indi-cating that government green procurement could effectively guide firm emission behavior without relying on mandatory environmental regulation.(2)Regarding mechanisms,government green procurement operated through two channels:the endogenous driver mecha-nism,whereby stable expectations of green demand and government credit endorsement enhanced firms'attention to frontier technolo-gies,increased green invention patent outputs,and promoted digital transformation,thereby improving resource allocation and energy ef-ficiency;and the institutional constraint mechanism,whereby strengthened contractual constraints,disclosure requirements,and multi-stakeholder supervision improved firms'internal control quality and environmental information transparency,thereby constraining high-carbon behaviors.(3)Heterogeneity analysis showed that the carbon reduction effects of government green procurement varied signifi-cantly across firms,with stronger effects observed in state-owned enterprises,non-pollution-intensive industries,small-and medium-sized firms,and firms located in regions with greater regulatory distance,indicating that the institutional environment and firm charac-teristics played an important role in shaping policy effectiveness.(4)From a supply chain perspective,further analysis showed that gov-ernment green procurement not only affected the firms that obtained government contracts but also generated a"chain reaction"through upstream and downstream linkages.Its emission reduction effects exhibited a multi-directional diffusion pattern within the supply chain network,forming a"network-like structure,"with such spillover effects being particularly pronounced in core chain-leading firms.Over-all,the findings suggest that by embedding environmental objectives into market-based transaction mechanisms,government green pro-curement achieved effective constraints on firm carbon emissions while maintaining economic stability,providing new empirical evi-dence on the role of demand-side policies in environmental governance.