Randomization Fixes Futarchy Bias

Decision‑conditional markets can become biased when one option is canceled and information arrives before the choice, causing prices to reflect selection rather than causal impact. Hanson argues this 'decision selection bias' can be mitigated by letting informed decision‑makers trade, announcing decision timing immediately before acting, or conditioning on randomized choices so prices can be read causally. — It offers concrete governance design rules for using prediction markets to guide public decisions without misreading biased prices as causal estimates.