R. Hanson suggests to use prediction markets to make better use of information to evaluate strategies in politics. He calls the combination of democracy and speculative market information processing futarchy. There is a short manifesto and a full paper (PDF).
The central idea is: Use democracy to express what you want, use prediction markets to evaluate how to reach these goals. People can give strategies which are traded after paying a small fee; when they seem to be efficient the get a payback, otherwise they loose the fee. Thus good strategies are rewarded, bad ones are not rewarded but cost an extra fee. Augmented GDP and other indicators give a measured value to the state of the country.