Based on data for green patent applications of listed companies in China from 2007 to 2021,this paper uses the smart city pilot policy as a natural experiment.It employs a multi-point difference-in-differences(DID)model to explore the impact of smart city construction on enterprise green technological innovation and the channel for this effect.The study finds that smart city construction has a significant promotional effect on both the quantity and quality of green technological innovation.This result holds following a series of robustness tests,including parallel trend,multi-period propensity-score-matching DID,and placebo tests.As regards the effect channel,smart city construction can promote green technological innovation through environmental protection subsidies provided by the government,alleviating financing constraints,and gathering high-quality talent and high-tech enterprises.Further analysis shows that the pilot policy has a greater promotional effect on the green technological innovation of state-owned,large-scale,and high-tech enterprises.This paper provides empirical evidence at the micro-level for the evaluation of smart city pilot policies and has important policy implications for improving the level of green technological innovation.
关键词
智慧城市/绿色技术创新/"数量"/"质量"/多期DID
Key words
smart city/green technology innovation/quantity/quality/multistage DID
万方数据