NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Aaron Chalfin

Goldman School of Public Policy
2607 Hearst Ave
University of California, Berkeley
Berkeley, CA 94720

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NBER Working Papers and Publications

February 2013The Effect of Police on Crime: New Evidence from U.S. Cities, 1960-2010
with Justin McCrary: w18815
We argue that the key impediment to accurate measurement of the effect of police on crime is not necessarily simultaneity bias, but bias due to mismeasurement of police. Using a new panel data set on crime in medium to large U.S. cities over 1960- 2010, we obtain measurement error corrected estimates of the police elasticity of the cost-weighted sum of crimes of roughly -0.5. The estimates confirm a controversial finding from the previous literature that police reduce violent crime more so than property crime.
 
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