Using new data at the police department level, I propose an identification strategy to estimate the causal effect that police militarization has on reducing violent crime. I show that previous estimates are likely to be contaminated by unobserved factors that simultaneously determine...

The opioid epidemic and migration along the US–Mexico border are two of the most-debated policy issues in recent US politics. We show how these two topics are interlinked: the US opioid epidemic generated large Mexican migration flows. We exploit the fact that in 2010, a series of reforms to...