TY - RPRT AU - Chakraborty, Anujit AU - Henkel, Luca TI - The Role of Interpersonal Uncertainty in Prosocial Behavior PY - 2025/Feb/ PB - Institute of Labor Economics (IZA) CY - Bonn T2 - IZA Discussion Paper IS - 17708 UR - https://www.iza.org/publications/dp17708 AB - In prosocial decisions, decision-makers face interpersonal uncertainty–uncertainty about how their choices impact others' utility. We use three approaches to show how it shapes classic patterns of prosocial behavior like ingroup favoritism, merit-based fairness, and self-favoring behavior. First, we compare standard allocation decisions with decisions where we remove social consequences but retain uncertainty, revealing strikingly similar patterns across both. Second, we exogenously vary interpersonal uncertainty to estimate the aversion to interpersonal uncertainty and quantify how it combines with preferences to determine prosocial decisions. Finally, we show that self-reported interpersonal uncertainty systematic ally predicts behavior across individuals, choice patterns, and behavioral interventions. KW - prosocial behavior KW - decision-making under uncertainty KW - interpersonal uncertainty KW - ingroup favoritism KW - merit-based fairness KW - self-favoring behavior ER -