For some time now it has been obvious that capitalism is the best financial system, while democracy is the best governing system. They are both based on human greed. Capitalism is about having some and making more of it. Democracy is about protecting your personal interests.
This works well most of the time but in some cases both of the systems raise ethical questions. Is it right that capitalism is effectively keeping the poor countries poor? Or, in case of democracy, we can't make drastic changes in environmental policies as it would be a political suicide to, for example, try to pass a law that bans fuel powered cars as personal transportation (you know it is ridiculous to have one person sitting inside a two-ton metal case driving to the store in the next block).
All the other options seem to have failed, though. So, my question is, do these systems work because they are tapped to one of the basic human emotions? They are not intellectual or subtle, they are based on a very basic self-preservation instinct.