中国数字经济对城市创新影响的空间效应及机制

The spatial effects and mechanisms of the impact of digital economy on urban innovation in China

基于2011—2020年中国地级及以上城市面板数据,剖析数字经济和城市创新的演化格局,并运用多种计量方法揭示数字经济对城市创新影响的空间效应与作用机制。研究发现:中国数字经济与城市创新发展水平总体均呈上升趋势,且在空间上呈现出“东高西低”的分异格局。数字经济发展对城市创新水平具有明显的促进作用,通过多种稳健性检验后,该结论仍然成立。同时,数字经济对城市创新的促进作用存在区域差异,在东部地区和中心城市更为显著。数字经济对城市创新影响的空间溢出效应存在明显的作用边界,在1200公里处达到峰值。通过影响机制分析发现,数字经济可通过提高研发强度和促进产业结构升级来影响城市创新发展。研究结果有助于深化对数字经济赋能城市创新的空间效应和机制的理解。

This study analyzes the spatiotemporal evolution patterns of the digital economy and urban innovation based on panel data at the city level from 2011 to 2020.Employing a spatial panel model,we examine the spatial effect and mechanisms of the digital economy on urban innovation.The study shows that the overall levels of both the digital economy and urban innovation in China have shown an upward trend,with a spatial pattern of“high in the east and low in the west”.The development of the digital economy significantly promotes urban innovation levels,which has been confirmed through the replacement of core explanatory variables,spatial weight matrices and endogeneity tests robust.We also find that the impact of the digital economy on urban innovation exhibits regional variations,with a more pronounced effect in the eastern region and central cities.The spatial spillover effect of digital economy on urban innovation follows a“U”shape,and demonstrates a distinct boundary,reaching its peak at a distance of 1200km.Digital economy can indirectly affect the level of urban innovation by improving the intensity of research and development and promoting the upgrading of industrial structure.This research contributes to a deeper understanding of the spatial effects and mechanisms of the impact of digital economy on urban innovation.