We study a simple evolutionary bargaining game and show that the efficiency of bargaining behavior can depend crucially on the tie breaking rule players use. In fact, in a certain limit all the surplus is wasted. Inefficiency arises for any role assignment procedure, as long as there is some...

In order to explain excess co-operation in the one-shot prisoner's dilemma game, we first question the standard assumption of stable and selfish preferences by introducing the concept of social capital. This analysis leads to a model that explains excess co-operation through an accumulation of...

We study fairness and reciprocity in a Hawk-Dove game. This allows us to test various models in one framework. We observe a large extent of selfish and rational behavior. Our results are inconsistent with leading models in this field.