- Futarchy uses prediction markets to guide decisions, but it fails when markets reflect correlation rather than causation.
- A key flaw emerges when one market is canceled after the other resolves, distorting incentives and prices.
- In an experimental market with two coins (A with 60% heads, B with uncertain bias averaging 59%), coin B's price rose to $0.90 despite a lower true probability, confirming the bias.
- Derivative markets did not fix the issue; prices remained misaligned with causal beliefs.
- The experiment demonstrates that futarchy can select worse options due to strategic betting and uncertainty resolution timing.
- The flaw persists even in realistic setups where information is gradually revealed before market close.