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This is a very nice article about the paper.
It's just an experience to read a Nobel-worthy piece of work in a few minutes.The Nash equilibrium is useful not just when it is itself an accurate predictor of how people will behave in a game but also when it is not, because then it identifies situations in which there is a tension between individual incentives and other motivations. A class of problems that have received a good deal of study from this point of view is the family of “social dilemmas,” in which there is a socially desirable action that is not a Nash equilibrium. Indeed, one of the first responses to Nash's definition of equilibrium gave rise to one of the best known models in the social sciences, the Prisoners' Dilemma.