) is added in order to introduce reciprocity. We find significantly higher rates of selfish choices in our treatments that …

refutes the self-interest hypothesis, suggesting that concerns for altruism, fairness, and reciprocity strongly motivate many … norm violators. We further illustrate the powerful impact of fairness concerns on cooperation, competition, incentives, and …

This paper surveys recent experimental and field evidence on the impact of concerns for fairness, reciprocity and … altruism on economic decision making. It also reviews some new theoretical attempts to model the observed behavior. …