ABSTRACT
Game theory based on rational choice is compared with game theory based on evolutionary, or other adaptive, dynamies, The Nash equilibrium concept has a central role to play in both theories, even though one makes extremely strong assumptions about cognitive capacities and common knowledge ofthe players, and the other does not. Nevertheless, there are also important difJerences between the two theories. These differences are illustrated in a number of games that model types ofinteraction that are key ingredientsfor any theory ofthe social contract.
