In Hart and Kurz (1983), stability and formation of coalition structures has been investigated in a noncooperative framework in which the strategy of each player is the coalition he wishes to join. However, given a strategy profile, the coalition structure formed is not unequivocally determined....

Different solution concepts for strategic form games have been introduced in order to weaken the consistency assumption that players' beliefs - about their opponents strategic choices - are correct in equilibrium. The literature has shown that ambiguous beliefs are an appropriate device to deal...

In previous papers we studied a game model in which players' uncertainty is expressed entirely in the space of probabilities (lotteries) over consequences, it depends on the entire strategy profile chosen by the agents and it is described by the so called ambiguous beliefs correspondences. In...

The performance to a collective task may require a certain degree of cooperation among agents. Is cooperation viable in the sense that individual needs are fulfilled, compromises are possible and the task is performed? A model of cooperation is presented in which compromises are also ruled by...

Previous literature shows that, in many different models, limits of equilibria of perturbed games are equilibria of the unperturbed game when the sequence of perturbed games converges to the unperturbed one in an appropriate sense. The question whether such limit property extends to the...

In this paper we consider a model of games of incomplete information under ambiguity in which players are endowed with variational preferences. We provide an existence result for the corresponding mixed equilibrium notion. Then we study the limit behavior of equilibria under perturbations on the...

In this paper, we look at the (Kajii and Ui) mixed equilibrium notion, which has been recognized by previous literature as a natural solution concept for incomplete information games in which players have multiple priors on the space of payoff relevant states. We investigate the problem of...

This paper studies the effect of intention-based reciprocity preferences on the free-riding problem arising in partnerships. Our results suggest a tendency of efficient partnerships to consist of members whose sensitivity to reciprocity is – individually or jointly – sufficiently high....