"Adam Smith's uncritically enthusiastic modern disciples portray his invisible hand theory as saying that market forces reliably harness selfish individuals to serve the common good. That's often true, but as Darwin recognized clearly, many traits that serve the interests of individual animals make life more difficult for larger groups."

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There are all sorts of institutions in the economic world which depart from the simple price/market model which I worked on in an earlier incarnation and which has been sort of the mainstream of economic theories since Adam Smith and David Ricardo. There are all sorts of contractual relations between firms and individuals which do not conform to the simple price theory - profit-sharing schemes and so forth - and the explanation for these suddenly became clear. We now understand why these emerged and that they are based on differences in information in the economy.

— Kenneth Arrow