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

We study cooperation within and between groups in the laboratory, comparing treatments in which two groups have … conflict. We model conflict using an inter-group Tullock contest, and measure its effects upon cooperation using a multi …-level public good game. We demonstrate that conflict increases cooperation within groups, while decreasing cooperation between …

We study cooperation within and between groups in the laboratory, comparing treatments in which two groups have … conflict. We model conflict using an inter-group Tullock contest, and measure its effects upon cooperation using a multi …-level public good game. We demonstrate that conflict increases cooperation within groups, while decreasing cooperation between …

of cooperation during war, we find that individual cooperativeness robustly increases with the length of time a person …

cooperation (at the very least, to a secession of hostilities) when such groups are faced with the threat of potentially stronger …

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 …