网络基础设施与数字经济产业化——来自“宽带中国”政策的准自然实验

Network Infrastructure and the Industrialization of Digital Economy:A Quasi-natural Experiment Based on the“Broadband China”Policy

加快推进数字经济产业化是助推中国实现经济高质量发展的重要举措。利用2004—2018年中国地级市层面数据,将"宽带中国"作为一项准自然实验,实证分析了网络基础设施对城市数字经济产业发展的影响。研究发现:"宽带中国"试点政策显著促进了数字经济产业发展,使"宽带中国"试点城市比其他城市提高约12.7%,并且此结论在多种稳健性检验中依然成立;"宽带中国"试点政策显著促进了东中西部地区、大规模和中等规模城市的数字经济产业发展,对小规模城市数字经济产业发展的影响不显著;"宽带中国"试点政策通过互联网应用效应和互联网产出效应途径促进了城市数字经济产业发展。

Accelerating the industrialization of the digital economy is an important measure for China to achieve high-quality economic development.By using data of China’s prefecture-level cities from 2004 to 2018,the paper takes“Broadband China”policy as a quasi-natural experiment to empirically analyze the impact of network infrastructure on the development of urban digital economy industry.The study shows that“Broadband China”pilot policy has significantly promoted the development of the digital economy industry,making the pilot cities have an increase of approximately 12.7%compared with other cities,and this conclusion is still valid in various robustness tests.The“Broadband China”pilot policy has significantly promoted the development of the digital economy industry in the eastern,central and western regions,especially in large and medium-sized cities,while the impact on small-scale cities is not significant.The pilot policy has promoted the development of the urban digital economy industry through the internet application effect and the internet output effect.