equilibrium strategy. Exclusion has a positive impact on cooperation when it is followed by a quick rather than a slow … retaliation. Post-exclusion cooperation and forgiveness depend not only on the length of exclusion but also on the perceived …

different benefits from cooperation. Although almost all heterogeneous groups agree to follow specific contribution rules with …

We experimentally investigate the nature of cooperation in various repeated games, with subjects from Romania and USA …. We find stark cross-country differences in the propensity to sustain multilateral cooperation through bilateral rewards …

We use skin conductance responses and self-reports of hedonic valence to study the emotional basis of cooperation and …. The application of sanctions activates a "virtuous emotional circle" that accompanies cooperation. Emotionally aroused … punished, and increase their subsequent level of cooperation. The outcome is an increased level of contribution that becomes …

. Cooperation is highest in groups in which there is a mix of juniors and seniors, suggesting that there are indeed benefits in …