Di Tella, Rafael; Schargrodsky, Ernesto - 2002
An important challenge in the crime literature is to isolate significant causal effects of police on crime. Following a … institutions (including schools, synagogues, mosques, cemeteries and clubs) were given 24-hour police surveillance. Thus, this … hideous event induced a geographical allocation of police forces that can be presumed exogenous in a crime regression. Using …