智慧城市建设提高区域绿色经济效率了吗?——基于试点城市的准自然实验

Has the Construction of Smart Cities Improved the Efficiency of Regional Green Economy?Quasi-natural Experiment Based on Pilot Cities

选取2009—2021年全国281个城市的面板数据,使用多期双重差分法实证分析了智慧城市建设的经济内涵及理论机制。研究结果表明,智慧城市建设对绿色经济效率有显著的提升作用,且存在区域、规模、数字基础设施以及城市资源异质性,即智慧城市建设对西部地区绿色经济效率的提升作用强于东部、中部地区和东北地区的城市,对特大城市绿色经济效率的提升作用强于大型城市和中小城市,对数字基础设施薄弱以及非资源型城市的绿色经济效率的提升作用更强。进一步的机制分析显示,规模效应、流动效应是智慧城市建设提升绿色经济效率的主要路径,创新效应则起调节作用。

Panel data of 281 cities in China from 2009 to 2021 were chosen to empirically analyze the economic connotation and theoretical mechanism of smart city construction by using the method of multi-period difference-in-differences.The research results indicate that the construction of smart cities has a significant improvement effect on the efficiency of green economy,and there are regional,scale,digital infrastructure,and urban resource heterogeneities.That is,the construction of smart cities has a stronger effect on improving thegreen economic efficiency in western regions than in cities intheeastern,central,and northeastern regions.The improvement effect on green economic efficiency in mega cities is stronger than that of the large cities and small and medium-sized cities.Furthermore,it has a stronger effect on improving the green economic efficiency in cities with weak digital infrastructure and non-resource based cities.Further mechanism analysis shows that scale effect and flow effect are the main paths for smart city construction to improve green economic efficiency,while innovation effect plays a regulatory role.