We study the effects of voluntary participation on cooperation in collective action problems. Voluntary participation … may foster cooperation through an entry mechanism, which leads to assortative selection of interaction partners, or an …

We study the coevolution of cooperation, preferences and cooperative signals in an environment where individuals engage …

post announcement mechanism does not have a significant effect on the cooperation rate. However, the nudge leads to a … striking increase in the cooperation rate. We provide suggestive evidence that the nudge we use provides subjects with a focal …

Evolution of cooperation has traditionally been studied by assuming that individuals adopt either of two pure … strategies, to cooperate or defect. Recent work has considered continuous cooperative investments, turning full cooperation and … promotes the evolution of cooperation, our investigation gives a comprehensive picture of how relatedness affects the evolution …

factors that are known to affect cooperation levels, and in so doing replicate and extend previous empirical research on …

Previous research on cooperation has primarily focused on egalitarian interactions, overlooking a fundamental feature …-group conflict, individuals who possess high rank or power tend to show less cooperation. How, then, is cooperation achieved within … cooperation and strategies, such as punishment and gossip, to promote cooperation in social dilemmas. In two studies involving …

taxation. In addition, we find that local social interaction among subgroups of participants also boosts cooperation. …