Drugs on the Web, Crime in the Streets. The impact of Dark Web marketplaces on street crime

The Dark Web has changed the way drugs are traded globally by shifting trade away from the streets and onto the web. In this paper, I study whether the Dark Web has an impact on street crime, a common side effect of traditional drug trade. To identify a causal effect, I use daily data from the US and exploit unexpected shutdowns of large online drug trading platforms. In a regression discontinuity design, I compare crime rates in days after the shutdowns to those immediately preceding them. I find that shutting down Dark Web markets leads to a significant increase in drug trade in the streets. However, the effect is short-lived. In the days immediately following shutdowns, drug-related crimes increase by five to almost ten percent but revert to pre-shutdown levels within ten days. I find no impact of shutdowns of Dark Web marketplaces on thefts, assaults, homicides and prostitution.