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Ethnographic evidence, empirical research, and results of experimental studies suggest that people across cultures invest in prosocial behavior, but little research addresses the relative importance of personal versus group incentives to invest in prosocial behavior. We estimate the relative weight of personal and group incentives for households to invest in prosocial behavior using two waves of panel data (2001 and 2002)from ca. 350 Tsimane' Amerindians, a foraging-farming society in the Bolivian Amazon. We found that some personal incentives bore a significant association with household decisions to display prosocial behavior. Consistent with previous research, we found that investments in prosocial behavior first rise and then decline with age, and that cash income bore a positive association with investments in prosocial behavior. We found no evidence that group incentives were associated with personal investments in prosocial behavior once we eontrolled for fixed attributes of villages, but those fixed attributes did explain a significant share of the variation in the data. [ABSTRACT FROM AUTHOR]