We show that subjects who set their minimum acceptable offer to zero in an ultimatum game are the most generous players in a dictator game. This finding challenges the interpretation of the acceptance of low offers as payoff-maximizing behavior.

There is not general consensus about if women are more or less generous than men. Although the number of papers supporting more generous females is a bit larger than the opposed it is not possible to establish any definitive and systematic gender bias. This paper provides new evidence on this...