Altruists and envious people who meet in contests are symbionts. They do better than a population of narrowly rational …

Envy and altruism have been studied extensively in adults. Here, we report data from an experiment studying envious and … treatments. One treatment investigates envy, the other one studies altruism. Additionally, we collect data on the children …-demographic information have limited predictive power in both treatments. -- artefactual field experiment ; children ; envy ; altruism …