State Building in the City: The Effects of Public Security and Services on Crime, Violence and State Legitimacy with Christopher Blattman

Colombia’s government set out to reduce crime and violence and increase state legitimacy by raising state presence on the streets of Bogotá, either doubling police patrol time or delivering cleanup and lighting services. We evaluate the effects of those interventions over an 8-month window. Interventions at this scale, in a dense network of streets, require us to account for spillovers into control segments. The policy implications also hinge on these spillovers. We show how to design place-based experiments to test for spatial spillovers over varying distances, and estimate direct and spillover effects using randomization inference. Using administrative data alongside a citywide survey, we find that increasing state presence reduces insecurity on targeted streets, and that there may be increasing returns to state presence and to targeting the least secure places. But data suggests that targeted state presence simply pushes insecurity around the corner.

Chris Blattman is the Ramalee E. Pearson Professor of Global Conflict Studies at the University of Chicago’s Harris School of Public Policy. He is an economist and political scientist who studies poverty and violence in developing countries, and has worked mainly in Colombia, Liberia, Uganda, and Ethiopia. Professor Blattman was previously faculty at Columbia and Yale Universities, and holds a PhD in Economics from the University of California at Berkeley and a Master’s in Public Administration and International Development (MPA/ID) from the Harvard Kennedy School.