' prosocial attitudes are systematically related to elementary school children's prosociality. In a second step, we present … evidence on a randomly-assigned variation of the social environment, providing children with a mentor for the duration of one … gap in prosociality between low and high SES children. A mediation analysis of the observed treatment effect suggests that …

-selected students as participants. This is potentially problematic as students participating in experiments may behave systematically … different than non-participating students or non-students. In this paper we empirically investigate whether laboratory … experiments with student samples misrepresent the importance of social preferences. Our first study shows that students who …