While age-based discrimination is considered undesirable, we know little about the accuracy of age stereotypes and their effects on cooperation. To investigate the effects of age stereotypes on cooperation, we presented older adults (over age 50) and younger adults (under age 25) with...

We investigate the motives for cooperation in the one-shot Prisoner’s Dilemma (PD). A prior study finds that cooperation rates in one-shot PD games can be ranked empirically by the social surplus from cooperation. That study employs symmetric payoffs from cooperation in simultaneous PD games....