The Mark Moss Show The Hidden Risk Markets Can’t Price In: Irrationality | Yaron Brook
Mar 7, 2026
Yaron Brook, chairman of the Ayn Rand Institute and advocate of rational capitalism, explains why large-scale irrationality is a risk markets struggle to price. He discusses how emotional politics, regulation, meme-stock dynamics, and education shape market distortions. Conversation covers capitalism’s role in reducing poverty, free trade, AI disruption, and practical ways individuals can protect themselves amid growing irrationality.
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Markets Break When Society Embraces Irrationality
- Markets price measurable risks well but fail to price large-scale irrational human behavior when societies abandon reason.
- Yaron Brook argues emotional politics and narratives override incentives, causing markets to misprice and sometimes break rather than just deviate temporarily.
Rational Money Pulls Markets Back Over Time
- Rational money tends to correct price deviations because profitable arbitrage draws capital to fix mispricings.
- Brook notes irrational episodes can last longer today, but in the long run rational investors with capital restore prices.
Meme Stock Mania Exposed Retail Irrationality
- Meme stock rallies in January 2021 showed retail-driven, non-fundamental price moves that lasted months.
- Brook recalls hedge funds profited by shorting as the mania collapsed and one fund even went bankrupt amid the squeeze.