We study with a sample of 1,070 primary school children, aged seven to eleven years, how altruism in a donation … theories of reciprocal altruism that provide a cornerstone to understand human social behavior. We find that higher risk …-linear. We confirm earlier results that altruism increases with age during childhood and that girls are more altruistic than boys …

that there are large inter-country differences in the degree of selfishness and altruism, with the Japanese and Chinese … religiosity appear to be the main cause of inter-country differences in the degree of selfishness and altruism. …