【摘要】 选取2003—2023年中国286个城市的面板数据，采用多期DID方法分析智慧城市政策对数字经济发展的阶段性影响。研究发现，相较于早期智慧城市试点政策，新型智慧城市建设对数字经济发展的促进作用更显著。经由机制剖析，新型智慧城市凭借提升城市的创新能力及信息产业的发展水平，驱动了数字经济的蓬勃发展。异质性分析表明，政策效果在东部、中部地区以及科教资源较弱、行政层级较低的城市更为突出，对数字经济的提升效果更为显著。更多还原

【Abstract】 This study utilizes panel data from 286 Chinese cities spanning the period 2003–2023 to analyze the phased effects of smart city policies on the development of the digital economy, employing a multi-period Difference-in-Differences(DID) approach. The findings reveal that the new-type smart city initiative exerts a significantly stronger promotional effect on the digital economy compared to earlier pilot policies. Mechanism analysis indicates that new-type smart cities drive the vigorous growth of the digital economy primarily by enhancing urban innovation capabilities and advancing the information technology industry. Heterogeneity analysis demonstrates that the policy effect is more pronounced in eastern and central regions, as well as in cities with less developed scientific and educational resources and lower administrative tiers, where the enhancement effect on the digital economy is more significant.更多还原