世界农业

本文以2008—2021年中国286个地级及以上城市为研究样本，将“宽带乡村”试点工程和电信普遍服务试点项目视为乡村数字基础设施建设的一项准自然实验，通过构建多期双重差分模型，系统考察了乡村数字基础设施建设对共同富裕的影响效应及内在机制。实证研究发现，乡村数字基础设施建设可以缓解数字鸿沟，缩小城乡收入差距，从而促进共同富裕。机制在于，乡村数字基础设施建设通过降低信息获取成本和加强政府数字治理的方式促进共同富裕。拓展研究还发现，乡村数字基础设施建设具备时间累积效应和强外部性的双重特征，运行时间越长对所在地区产生的福利价值越高，而且由于溢出效应对相邻地区也产生了促进作用，对共同富裕目标的实现具有重要贡献。据此，本文提出加强乡村数字基础设施建设，促进数字化赋能共同富裕跨越式发展，加快补齐短板；统筹多方力量，推广数字化教育，深化数字化治理的应用，实现乡村数字基础设施的提档升级；优化数字基础设施的时空布局，构建城乡协同发展网络，推动发展成果共享的政策启示。

This paper takes 286 cities at prefecture level and above in China from 2008 to 2021 as research samples, regards the pilot project of “broadband countryside” and the pilot project of universal service of telecommunication as a quasi-natural experiment of rural digital infrastructure construction, and systematically examines the impact of rural digital infrastructure construction on the economic and social development of the countryside by constructing a multi-period double-difference model.By constructing a multi-period double-difference model, we systematically examined the effect of rural digital infrastructure construction on common prosperity and its internal mechanism.The empirical study finds that the construction of rural digital infrastructure can both alleviate the digital divide and narrow the income gap between urban and rural areas, thus promoting common prosperity.The mechanism lies in the fact that the construction of rural digital infrastructure promotes common prosperity by way of reducing the cost of information access and strengthening the government's digital governance.Extended research also finds that rural digital infrastructure construction has the dual characteristics of time-accumulation effect and strong externalities, which not only has a higher welfare value for the region where it is located the longer it has been in operation, but also makes an important contribution to the realization of the goal of common prosperity due to the spillover effect on neighboring regions.Accordingly, this paper proposes the following policy implications: strengthening the construction of rural digital infrastructure to facilitate digital empowerment and leapfrogging development towards common prosperity, and accelerating the remediation of shortcomings; coordinating multiple forces to promote digital education, deepening the application of digital governance, and achieving the upgrading of rural digital infrastructure; optimizing the spatial and temporal layout of digital infrastructure, building a network for urban-rural synergetic development, and promoting the sharing of development achievements.