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Illegal Markets

The policy construction of illegal markets: Exploring variation, success, failure, and unintended consequences

PNAS 123/33 pp. e2515300123-e2515300123 2026-08-10 Original The policy construction of illegal markets: Exploring variation, success, failure, and unintended consequences Letizia Paoli, Peter Reuter Abstract Illegal markets, broadly defined to include markets where only specific transactions are illegal, are the consequence of policy, either a prohibition or highly restrictive regulation. They are generated by a variety of concerns, some moral, some pragmatic. They are often tied to legal markets, complicating the policy process. These markets are ubiquitous, rarely well controlled and little studied as markets. This article examines variations in illegality from the case studies in this Special Feature and synthesizes what can be learned about the success and failure of different approaches to controlling these markets. Control is often weak because powerful legal interests are opposed to tight regulation and, especially in markets with large underlying demand, rarely leads to substantial reductions in the targeted activity, unless draconian methods are used. As demonstrated by drug markets, tough enforcement can have large adverse collateral consequences. The paper concludes by suggesting that an extension of the harm reduction framework developed specifically for drug policy can be applied usefully to making policy choices in controlling other illegal markets.

The illegal market for sex in the United States: Insights from economic research

PNAS 123/33 pp. e2512375122-e2512375122 2026-08-10 Original The illegal market for sex in the United States: Insights from economic research Manisha Shah Abstract The illegal market for sex in the United States generates significant economic activity yet remains understudied due to its illegality and clandestine nature. This paper synthesizes existing empirical evidence documenting aspects of market structure, impacts of regulation, and notable changes over time. Criminalization, while intended to suppress the market, often exacerbates harms by displacing activity underground, increasing violence against sex workers, and elevating disease transmission risks. Natural experiments, including decriminalization episodes in Rhode Island and policy shifts in Europe, reveal that decriminalization can reduce sexually transmitted infections and violence against women. Additionally, technological shifts-particularly the rise of online platforms due to the internet-have reshaped market organization. These findings challenge conventional legal and moral frameworks and underscore the need for evidence-based policymaking to guide effective regulation of sex markets.