Do migrants lead to an increase of crime rates in their host societies? This highly contentious issue has become a mainstay in the political debate and a lightning rod for the galvanization of populist movements, despite often lacking any empirical support. In this game-changing book, the...

More policing reduces crime but little is known about the mechanism. Does policing deter crime by reducing its attractiveness, or because it leads to additional arrests of recurrent criminals? This paper provides evidence of a direct link between policing and arrests. During shift changes a...

An influential literature has used the aftermath of terrorist attacks to estimate large effects of police street deployment on crime. However, the elasticities obtained in these settings may not easily extrapolate to more standard circumstances. This paper exploits a natural experiment that...