NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Donald Green

Department of Political Science
Columbia University
420 W. 118 Street
7th Floor IAB
New York, NY 10027

E-Mail: EmailAddress: hidden: you can email any NBER-related person as first underscore last at nber dot org
Institutional Affiliation: Columbia University

NBER Working Papers and Publications

October 2017Place-Based Interventions at Scale: The Direct and Spillover Effects of Policing and City Services on Crime
with Christopher Blattman, Daniel Ortega, Santiago Tobón: w23941
Cities target police patrols and public services to control crime. What are the direct and spillover effects of such targeted state services? In 2016 the city of Bogotá, Colombia, experimented on an unprecedented scale. They randomly assigned 1,919 streets to either 8 months of doubled police patrols, greater municipal services, both, or neither. We study how crime responds to intensifying normal state presence in moderate- to high-crime streets, and what this implies about criminal behavior. Scale also brings challenges. Spatial spillovers in dense networks introduce bias and complicate variance estimation through “fuzzy clustering.” But a design-based approach and randomization inference produce valid hypothesis tests in such settings. We find that increasing state presence has modest di...
 
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