experiment corroborates these findings and confirms that donors are motivated by the economic value of the items offered. We also …

a strong decrease in spitefulness with increasing age. Egalitarianism becomes less frequent, and altruism much more …

We study with a sample of 1,070 primary school children, aged seven to eleven years, how altruism in a donation … experiment is related to children's risk attitudes and intertemporal choices. Examining such a relationship is motivated by … theories of reciprocal altruism that provide a cornerstone to understand human social behavior. We find that higher risk …

merits of different procurement systems. We conducted a randomized survey experiment with a representative sample of 826 …

's contacts. However, results from a field experiment where broadcasting of the initial pledges was randomized suggest that the … observational findings were likely due to homophily rather than genuine social contagion effects. The experiment also shows that … (30 out of 6.4 million users reached) were made. Finally, an online survey experiment showed that both the presence of an …