Dependency equilibria: real points in the Spohn variety

Motivated by the great riddle in game theory of establishing cooperation as a rational solution in the Prisoner’s Dilemma, the philosopher Wolfgang Spohn poses a new equilibrium concept: dependency equilibria.

In this talk we study dependency equilibria from an algebraic viewpoint as the probabilities inside the so-called Spohn variety and, for 2x2 games, explore the possible density of real points within this variety by looking at its planar model.