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