-link structure. We test the implications of our model in a laboratory experiment. -- cooperation ; conflict, defence ; signaling … observe surprisingly high levels of cooperation and altruism within groups in conflict situations such as civil wars. We …

observe surprisingly high levels of within - group cooperation in conflict situations such as civil wars. We provide an … model from cooperation in defence to cooperative and altruistic behavior in general …

observe surprisingly high levels of cooperation and altruism within groups in conflict situations such as civil wars. We …