Draca, Mirko; Machin, Stephen; Witt, Robert - Centre for Economic Performance, LSE - 2008
In this paper we study the causal impact of police on crime by looking at what happened to crime before and after the … identifies a causal impact of police on crime. Implementing an instrumental variable approach shows an elasticity of crime with … respect to police approximately -0.3, so that a 10 percent increase in police activity reduces crime by around 3 percent. …