
The Origins Podcast with Lawrence Krauss Alvin Roth: Moral Economics, from Prostitution to Kidney Transplant Markets
May 12, 2026
Alvin Roth, Nobel Prize winning economist known for matching theory and market design, discusses controversial real-world markets. He talks about legalization of prostitution and evidence from natural experiments. He explores kidney transplant shortages, exchange chains, and proposals to compensate donors. He also covers surrogacy, assisted dying, repugnance as a constraint, and how evidence should guide policy.
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Turn Matching Theory Into Market Design Action
- Treat market design as active problem solving, not just theory; move from describing failures to fixing them.
- Roth shifted from proving couples-made matching hard to redesigning the medical residency match to accommodate two-career households.
Repugnance Explains Market Taboo Dynamics
- Repugnance is a key social constraint that blocks otherwise beneficial markets when some object to transactions they don't directly suffer from.
- Alvin Roth defines repugnant transactions as those some want but others oppose for moral reasons, like same-sex marriage or IVF.
Rhode Island Natural Experiment On Prostitution
- A natural experiment in Rhode Island accidentally legalized indoor prostitution for ~6 years and was studied by economists Cunningham and Shah.
- Their analysis found reduced sexually transmitted diseases and fewer sexual assaults during that period compared with neighboring states.




