Do Immigrants Cause Crime?

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We examine the empirical relationship between immigration and crime across Italianprovinces during the period 1990-2003. Drawing on police administrative records, we first document that the size of the immigrant population is positively correlated with theincidence of property crimes and with the overall crime rate. Then, we use instrumentalvariables based on immigration toward destination countries other than Italy to identifythe causal impact of exogenous changes in Italy's immigrant population. According tothese estimates, immigration increases only the incidence of robberies, while leaving unaff ected all other types of crime. Since robberies represent a very minor fraction of allcriminal o ffenses, the eff ect on the overall crime rate is not signi cantly di fferent from zero.

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