We analyse interethnic cooperation in an infinitely repeated prisoner’s dilemma when members of one group are unable to target punishment towards individual defectors from the other group. We first show that indiscriminate outgroup punishment may sustain cooperation in this setting. Our main...

We consider a dynamic model of conformity that permits both a conformist and non-conformist equilibrium. We provide conditions under which conformity can 'invade' a population. More precisely, starting from a non-conformist equilibrium, we show that the conformity of an arbitrarily small...

We model a simple dynamic process in which boundedly rational agents learn through their interactions with others. Of interest is to study the process of contagion where by one action 'spreads throughout the population' and becomes conventional. We vary the network of player interaction between...

We introduce the novel concept of a three-dimensional payoff matrix based on a simplified version of a card game. This matrix is necessary to represent the three variables which correspond to the dynamics of the game. We find Sonnaville-Mensink Equilibria (SME) that represent the optimal actions...

The ultimatum game models social exchange in situations in which the rational motive to maximize gains conflicts with fairness considerations. Using two independent behavioral measurements, the authors tested two contradicting predictions: that the preference for fairness is a deliberative...

How can a rational player strategically control a myopic best reply player in a repeated two-player game? We show that in games with strategic substitutes or strategic complements the optimal control strategy is monotone in the initial action of the opponent, in time periods, and in the discount...