In one of the most influential existence theorems in mathematics, John F. Nash proved in 1950 that any normal form game has an equilibrium. More than five decades later, it was shown that the computational task of finding such an equilibrium is intractable, that is, unlikely to be carried out...

The paper presents the concept of an imitation equilibrium and explores it in the context of some simple oligopoly models. The concept applies to normal form games enriched by a reference structure specifying a reference group for every player. The reference group is a set of other players, whom...