Fig. 1.

Distribution of choices capturing prosociality. Note: This figure reports participants’ decisions in three of the five Risk Dictator Games that they played. In the Risk Dictator Game, a dictator chooses with what risk (0%, 20%, 40%, 60%, 80%, or 100%) a recipient loses his/her endowment of $10. Putting higher risk on the recipient increases the payoff of the dictator. In the small benefit game, dictators receive $0.5 for each additional 20% risk they put on the recipient. In the medium benefit game, they receive $2 for each additional 20% risk. In the large benefit game, they receive $10 for each additional 20% risk. Appendix Fig. A.1 shows the distribution for the two other games, in which the dictator increases his/her payoff by an additional $1 (small-medium benefit) and $5 (medium-large benefit) for each additional 20% risk.