By abstracting from communication and enforcement systems and by treating perfect symmetry between players as the general case rather than a special one, game theory may have overshot the level at which the most fruitful work could be done and may have defined away some of the essential ingredients of typical nonzero-sum games. Preoccupied with the solution to the nonzero-sum game, game theory has not done justice to some typical game situations or game models and to the “moves” that are peculiar to nonzero-sum games of strategy.

Thomas C. Schelling, The Strategy of Conflict, loc. 284