Charles Darwin (1874) stated that "women are less selfish but men are more competitive". Very recent papers (Eckel & Grossman, 1998, 2001 or Andreoni & Vesterlund 2001, among others) have shown the relevance of gender in altruism in both ultimatum and dictator games. In this paper we analyse the...

In this paper we obtain empirical evidence of the relationship between individuals' risk attitudes and individuals' beliefs on their rival's choices in the Prisoners' Dilemma game. We find that (i) Risk-averse subjects seem to think that their opponent will defect, (ii) Risk-loving individuals...