US states have implemented many policies to lessen the severity of the opioid crisis. This study investigates two classes of policies--Prescription Drug Monitoring Programs (PDMPs) and their usage mandates and ``Pill Mill Bills"--and their effects on illicit drug markets. PDMPs and their...

A subset of harm reduction strategies encourages individuals to switch from a harmful addictive good to a less harmful addictive good; examples include e-cigarettes (substitutes for combustible cigarettes) and methadone and buprenorphine (substitutes for opioids). Such harm reduction methods have...

Economic theories of rational addiction aim to describe consumer behavior in the presence of habit-forming goods. We provide a biological foundation for this body of work by formally specifying conditions under which it is optimal to form a habit. We demonstrate the empirical validity of our...

This paper presents a simple analytical model of the market for hard drugs. The key assumptions are (i) a distinction between new users and existing addicts, (ii) imperfect competition, (iii) selective marketing efforts towards potential users, and (iv) the existence of policy effects on...