This article reports the results of a simple bargaining experiment on the ultimatum-revenge game. The game enables to differentiate between fairness that is stimulated by intentional based motives, distributional motives, and fairness considerations that mix both motives. The laboratory...

We analyse two team settings in which one member in a team has stronger incentives to contribute than the others. If contributions constitute a sacrifice for the strong player, the other team members are more inclined to cooperate than if contributions are strictly dominant for the strong...

This article reports on a field study that has been conducted in the online computer game World of Warcraft. In a basic labor situation a principal gives an upfront wage to an agent (who is unaware that he is participating in an experiment) and asks him to conduct a real-effort task. The unique...

This article reports on a field study that has been conducted in the online computer game World of Warcraft. In a basic labor situation a principal gives an upfront wage to an agent (who is unaware that he is participating in an experiment) and asks him to conduct a real-effort task. The unique...

We experimentally show that current models of reciprocity are incomplete in a systematic way using a new variant of the ultimatum game that provides second-movers with a marginal-cost-free punishment option. For a substantial proportion of the population, the degree of first-mover unkindness...