基于2011—2021年中国专利申请微观层面数据和212个后发城市地级市层面数据,构建平衡面板数据,考察数字基础设施建设对后发城市经济追赶的影响效应,并从城际创新合作视角探析该影响效应的传导机制。研究发现,数字基础设施建设不仅有助于缩小后发城市与先发城市的相对经济差距,而且促进了后发城市全要素生产率的提升。异质性分析表明,经济水平、地理区位等追赶情境差异均会影响数字基础设施建设发挥经济追赶的助推效应。作用机制分析表明,城际创新合作是数字基础设施建设影响后发城市经济追赶的重要渠道。并且,城际创新合作机制呈现出普惠发展与质量提升的双重特征,从合作城市看,不论与先发城市还是后发城市进行创新合作,均能促进后发城市经济追赶,而从创新类型看,主要通过实质性创新合作而非策略性创新合作助推后发城市经济追赶。
Based on the micro-level data of China patent application from 2011 to 2021 and the level data of 212 developing cities, the balanced panel data is constructed to examine the impact of digital infrastructure on the economic catch-up of developing cities, and to explore the transmission mechanism between them from the perspective of intercity innovation collaboration. The study finds that the construction of digital infrastructure not only helps developing cities narrow the relative economic gap with developed cities but also promotes the improvement of total factor productivity in developing cities. Heterogeneity analysis indicates that catch-up scenarios such as economic levels and geographical locations all affect the effects of digital infrastructure on economic catch-up. The mechanism analysis shows that intercity innovation collaboration is an important channel for the impact of digital infrastructure on the economic catch-up of developing cities. Further, the intercity innovation collaboration transmission path has both the features of inclusive development and quality improvement. In terms of cooperative city, whether a developed or a developing city, innovation collaboration can promote the economic catch-up. In terms of the type of innovation, it is mainly the substantive innovation collaboration rather than the strategic innovation collaboration that promotes the economic catch-up.
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