police forces tasked with preventing crime. We study the 1829 formation of the London Metropolitan Police - the first … professional force worldwide. Using newly digitized and geocoded crime and police data together with difference-indifferences and …

In this paper we study the causal impact of police on crime by looking at what happened to crime before and after the … terror attacks that hit central London in July 2005. The attacks resulted in a large redeployment of police officers to … central London boroughs as compared to outer London - in fact, police deployment in central London increased by over 30 …