区域一体化扩容能促进城市绿色发展吗?——基于长三角经济协调会的准自然实验

Can Regional Integration and Expansion Promote Green Urban Development?A quasi-natural experiment based on the Yangtze River Delta Economic Coordination Council

利用华东地区76个地级市2004—2020年的面板数据,以绿色全要素生产率为衡量绿色发展的指标,将2013年的长三角扩容作为准自然实验,采用DID模型分析了区域一体化扩容对城市绿色发展的影响及作用机制。研究发现:区域一体化扩容对城市的绿色发展有显著的提升作用,且对原位城市绿色效应更大,稳健性检验结果同样具有可靠性;机制分析表明,区域一体化扩容均可以通过推动技术创新与增强环境规制来促进原位与新进城市的绿色发展。此外,原位城市还可以通过促进劳动力集聚来推动城市的绿色发展。

Utilizing panel data spanning 2004 to 2020 from 76 prefecture-level cities in East China,this study employed green total factor productivity as an indicator to assess green development.The expansion of the Yangtze River Delta in 2013 served as a quasi-natural experiment,and the Difference-in-Differences(DID)model was employed to analyze the impact and mechanisms of regional integration and expansion on urban green development.The findings highlight that regional integration and expansion significantly influence the green development of cities,with a more pronounced effect on in-situ cities.The robustness test results reinforce the reliability of these findings.Mechanism analysis indicates that regional integration and expansion facilitate the green development of both in-situ and new cities by fostering technological innovation and strengthening environmental regulations.Additionally,in-situ cities contribute to the green development of urban areas by promoting labor agglomeration.