Face-to-face communication drastically increases cooperation rates in social dilemmas. We test which factors are the most important drivers of this communication gap. We distinguish three main categories. First, communication may decrease social distance. Second, communication may enable...

Evolutionary explanations of anger as a commitment device hinge on two key assumptions. The first is that it is predictable, ex-ante, whether someone will get angry when feeling that they have been badly treated. The second is that anger is associated with destructive behavior. We test the...