Starting from the quasi-natural experiment of the"Broadband China"pilot project,using a multi-phase DID model and urban panel data from 2008 to 2020,the empirical results show that digital infrastructure construction promotes urban green technology innovation,and compared to green strategy innovation,the promotion effect of digital infrastructure construction on green substantive innovation is more obvious.After PSM-DID,excluding other policy interference,counterfactual analysis,and instrumental variable testing,the core conclusion still holds.When examining the differentiated characteristics of cities,it finds that this enhancement effect follows the law of marginal decline in different levels of cities.Cities with higher levels of environmental regulation,talent aggregation,fiscal expenditure,and openness can significantly enhance the green technology innovation effect of digital infrastructure construction.Further mechanism testing indicates that digital infrastructure construction has an impact on urban green technology innovation through two channels,that is financial development level,and technological research and development investment.Therefore,we should create a good digital industry ecosystem and provide underlying support for urban green innovation,carry out digital infrastructure construction according to the situation based on the comparative advantage,pay attention to the development of finance and technology,and break through the"bottleneck"of green innovation path.
关键词
数字基础设施/绿色技术创新/多期DID/宽带中国/"双碳"目标
Key words
digital infrastructure/green technology innovation/Mphase DID/Broadband China/"double carbon"target
万方数据