Are all kind acts equal? Exploring the role of prosocial act characteristics in actor's positive affect

In this paper, we use data from a longitudinal online study to examine how characteristics of prosocial behaviors influence the level of positive affect they produce. Although much work has found that prosocial behaviors benefit those who enact them, the question remains if and how these effects vary based on characteristics of those acts. Using models that adjust for co-occurrence among act characteristics, we find that positive affect produced by prosocial acts is greater for those acts that: involve giving money or items, are seen as unusually kind, elicit positive feedback, and are varied over time. However, we find that the actor's relationship to the beneficiary, reaping benefits from prosocial acts, and the number of successive acts made no difference in terms of resultant positive affect. We conclude with a discussion of potential mechanisms explaining these differing effects and explore practical implications for kindness interventions.