Mirko Draca, Stephen Machin, Robert Witt, 06 August 2007

The reverse causality problem makes it difficult to test empirically the impact of additional police on crime rates. The massive re-deployment of police after the July 2005 London bombings provides a natural experiment that gets around this. Results show that more police do indeed reduce crime.

Francesco Drago, Roberto Galbiati, Pietro Vertova, 30 July 2007

Among the many factors that influence the decision to commit a crime, public law and sanctioning activity play a crucial role. The authors of CEPR DP6401 find that among their dataset in Italy an additional month of expected punishment reduces the propensity to recommit a crime by 1.24%.

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