Futarchy

A governance model (Robin Hanson) that decides policy via prediction markets — 'vote on values, bet on beliefs'. The community votes on a metric to optimise; conditional adopt/reject markets predict the metric under each choice, and the higher-predicted path is enacted. Powerful for aggregating information but fragile: it optimises exactly the chosen metric (which can be gamed) and needs deep, liquid markets to resist manipulation. Tested by MetaDAO.