国家自主创新示范区设立对城市绿色科技创新的影响研究——基于双重差分法的实证研究

Research on the Influence of the Establishment of National Independent Innovation Demonstration Zone on Urban Green Science and Technology Innovation--Empirical Analisis Based on the DID Method

绿色科技创新是助推中国高质量发展的重要驱动力,绿色科技创新的发展离不开国家自主创新示范区的支撑和引导,近年来各地纷纷被批准设立示范区,这一举措是否能促进中国城市绿色科技创新尚不得而知。本文采用双重差分法分析了示范区设立这一准自然试验对城市绿色技术创新的影响,选取增加控制变量、反事实检验法进行稳健性检验,并进行滞后性探索和异质性分析。结果显示:(1)示范区设立对城市绿色技术创新有着显著的正向促进作用;(2)此促进作用存在一定的滞后性;(3)异质性分析表明示范区设立对不同地区城市绿色科技创新影响存在显著差异,对创新水平较高地区的绿色科技创新有显著影响,对创新水平较低的地区城市绿色科技创新效果不明显。

Green technology innovation is an important driving force for promoting high-quality development in China.The development of green technology innovation cannot be separated from the support and guidance of national independent innovation demonstration zones.In recent years,various regions have been approved to establish demonstration zones.It is unclear whether this measure can promote green technology innovation in Chinese cities.This article uses the double difference method to analyze the impact of the quasi natural experiment of setting up a demonstration area on urban green technology innovation.It selects the addi⁃tion of control variables and the counterfactual test method for robustness testing,and conducts lag exploration and heterogeneity a⁃nalysis.The results show that:(1)the establishment of demonstration zones has a significant positive promoting effect on urban green technology innovation.(2)There is a certain lag in the promotion effect.(3)Heterogeneity analysis shows that the estab⁃lishment of demonstration zones has significant differences in the impact of green technology innovation on cities in different regions.It has a significant impact on green technology innovation in regions with higher innovation levels,while the effect on green technolo⁃gy innovation in cities with lower innovation levels is not significant.