Game theory is usually difficult to test precisely in the field because predictions typically depend sensitively on features that are not controlled or observed. We conduct one such test using field data from the Swedish lowest unique positive integer (LUPI) game. In the LUPI game, players pick...

This paper deploys a novel experiment to compare four theories that explain both selfish and non-selfish cooperation. The four theories capture incomplete information (à la Kreps et al. (1982)) alongside the following four non-selfish motives: caring about others (Altruism), being conscientious...

We consider coordination situations with a conflict of interest, and experimentally vary the inefficiency of an equal earnings equilibrium, as well as the number of efficient and unequal earnings equilibria. We observe that equality, as long it is not extremely inefficient, remains very salient,...