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Directed Altruism and Enforced Reciprocity in Social Networks*
The Quarterly Journal of Economics
Short Title: The Quarterly Journal of Economics
Format: Journal Article
Publication Date: 2009/11/01/
Pages: 1815 - 1851
Sources ID: 48456
Collection: Altruism
Visibility: Public (group default)
Abstract: (Show)
We conducted online field experiments in large real-world social networks in order to decompose prosocial giving into three components: (1) baseline altruism toward randomly selected strangers, (2) directed altruism that favors friends over random strangers, and (3) giving motivated by the prospect of future interaction. Directed altruism increases giving to friends by 52% relative to random strangers, whereas future interaction effects increase giving by an additional 24% when giving is socially efficient. This finding suggests that future interaction affects giving through a repeated game mechanism where agents can be rewarded for granting efficiency-enhancing favors. We also find that subjects with higher baseline altruism have friends with higher baseline altruism.