“…We suggest that rational interests, including loss-aversion, reputation management, and coordination signaling, combine to explain why so many people choose to volunteer. Because defection is viewed unfavorably relative to volunteering overvolunteering can occur, particularly among individuals who are socially close (Krueger et al, 2016). Overvolunteering (i.e., mutual volunteering) is a Type I error or wasted investment, whereas undervolunteering (mutual defection) is a Type II error or missed opportunity to do good (Heck & Krueger, 2015;Swets, Dawes, & Monahan, 2000).…”