Another is all around us - the market system. The premise here being that buyers will not knowingly act against their own interests. So sellers have incentives to bring that better mousetrap to market. There is literature now on extending markets to spheres formerly thought of as open only to the state - like the control of air pollution. Yet another is also all around us - vox populi.
Public opinion is a consensus process that moves with amazing speed with out modern communications.
I find obtaining comprehensive, balanced, and current information to be an incredible pain in the ass at this time.