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 …

An influential literature has used the aftermath of terrorist attacks to estimate large effects of police street … circumstances. This paper exploits a natural experiment that aimed to increase police presence in more than 6,000 well-defined areas … by police officers, we first document exogenous and discontinuous changes in patrolling intensity. We do not find that …

corruption. We compare the influences of latent enforcement (police, judicial, and prosecutorial employment) versus actual …