Fred is right, such institutions and laws have emerged out of trade. However, many laws are the product of deliberate legislation, and are not an unintended consequence of decentralized competition in markets. Hayek himself was ok with planning a few general or constitutional rules of social interaction, and this was not a part of his notion of mutual plan adjustment in a spontaneous order. Some public choice scholars try to import the idea of decentralized competition into electoral politics, but it really does not work the same in that context. Doug Mackenzie