We develop a theoretical framework to study illicit drugs markets, and we estimate it using data on drug purchases. Buyers are searching for high-quality drugs, but they can determine drugs' quality (i.e., their purity) only after consuming them. Hence, sellers can rip-off first-time buyers, or...

We consider a frictional two-sided matching market in which one side uses public cheap-talk announcements so as to attract the other side. We show that if the first-price auction is adopted as the trading protocol, then cheap talk can be perfectly informative, and the resulting market outcome is...