【摘要】 区域一体化在优化区域发展格局、强化区域间协作与联动方面发挥着显著的经济辐射效应，能有效缩小区域收入差距，为共同富裕目标的实现提供重要支撑。采用2009—2023年全国286个城市的面板数据，以国家级城市群发展规划为准自然实验，运用多期双重差分模型系统考察区域一体化对共同富裕的影响，并进一步基于修正的引力模型测度城市间经济辐射水平，探究区域一体化推动共同富裕的具体作用机制。研究发现，区域一体化政策能够显著提升城市共同富裕水平，且这种促进作用在中心城市、人口流入型城市、非资源型城市以及大型城市中更为明显。机制分析显示，区域一体化政策可以通过提升城市间经济辐射水平促进共同富裕的实现。进一步分析表明，区域一体化不仅有助于提高本地共同富裕水平，也对相邻城市产生了显著的正向空间溢出效应。据此，未来应持续推进区域一体化进程，完善差异化发展战略与要素流动机制，以增强经济辐射力，并推动共同富裕的实现。更多还原

【Abstract】 Regional integration plays a significant role in optimizing the regional development pattern and strengthening interregional cooperation and coordination, thereby exerting a notable economic radiation effect. This process effectively narrows regional income disparities, promotes high-quality economic development, and provides strong support for achieving common prosperity. Using panel data of 286 prefecture-level cities in China from 2009 to 2023, this study takes the implementation of national urban agglomeration development plans as a quasi-natural experiment. A multi-period difference-in-differences(DID) model is first employed to systematically examine the impact of regional integration on common prosperity. Furthermore, a modified gravity model is used to measure intercity economic radiation levels and explore the specific mechanism through which regional integration enhances common prosperity. The empirical results indicate that regional integration policies significantly improve the level of common prosperity, with stronger effects observed in central cities, population-inflow cities, non-resource-based cities, and large cities. Mechanism analysis shows that regional integration promotes common prosperity by enhancing intercity economic radiation. Further evidence suggests that regional integration not only fosters local common prosperity but also generates significant positive spatial spillover effects on neighboring cities. Accordingly, future policy efforts should continue to advance regional integration, improve differentiated development strategies and factor mobility mechanisms, and enhance economic radiation capacity to promote the realization of common prosperity.更多还原