Robin Hanson: This short "manifesto" describes a new form of government. In "futarchy," we would vote on Values, but bet on beliefs (Idea Futures). Elected representatives would formally define and manage an after-the-fact measurement of national welfare, while market speculators would say which policies they expect to raise national welfare... GDP is today the most common measure of national wealth. It seems hard for frequent travelers to escape the impression that people in high GDP nations tend to be richer and better off than those in low GDP nations. Economists thus tend to be willing to recommend policies that macroeconomic data suggest are causally related to increasing GDP. It seems that it is not that hard to, after the fact, tell rich satisfied nations from poor miserable ones. GDP may be good enough, and with the full attention of our elected representatives, we should be able to do even better, such as by including happiness, inequality, health, leisure, and environment measures.