By Jinmei Feng, Hong Ma, Mingzhi Xu, Wei You

This study estimates the causal impact of the massive installation of surveillance cameras on crime, using novel data from China between 2014 and 2019. Using the number of preexisting local camera producers as the instrument for the density of camera installation, we find that cities with denser surveillance networks experienced significantly faster declines in crime. The reduction is more pronounced for publicly visible crimes. Enhanced surveillance is associated with higher satisfaction with the government and a greater sense of security, leading to longer hours worked, especially for women. A back-of-envelope calculation shows preventing a crime costs approximately $5,922, which is highly cost-effective.

Unpublished paper, 2024