Social preferences across different populations: Meta-analyses on the ultimatum game and dictator game

International audience; We perform meta-regressions on a single database containing 96 observations of simple ultimatum games and 144 observations of simple dictator games to disentangle the fairness hypothesis based on the degree of economic development of a country. According to the fairness hypothesis, o ers in the two games should not di er if they were motivated by a subject's fairness concerns. Using the di erence across countries between o ers in ultimatum and dictator games, we address the e ect of being exposed to the market mechanism on pure fairness concerns and other-regarding, expectations-driven fairness. Our results show in particular that the lower the level of economic development in a country, the less likely the rejection of the fairness hypothesis.