Abstract
Several theories have been offered to explain the recent declines in the lethality and homicide rates in the United States. We hypothesize that technological innovations, which improved information transmission and shortened the response time between an aggravated assault incident and treatment, reduced the cost of saving lives and caused much of the decline in lethality and homicide rates in recent decades. Using difference-in-differences and regression-discontinuity designs, we show that improvements in emergency services (9-1-1) caused significant decreases in lethality and homicide rates. Various placebo and falsification tests support these findings.
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