“…When individuals are presented with information on the donation amount of previous donors their donation amount increases (for example Alpizar, Carlsson, & Johansson-Stenman, 2008a;Bekkers, 2012;Edwards & List, 2013;Martin & Randal, 2008;Shang, Croson & Reed, 2012;van Teunenbroek, 2016;van Teunenbroek et al, 2020). Only three studies (Croson & Shang, 2008;Kubo, Shoji, Tsuge, & Kuriyama;Meyer & Yang, 2015) that examined effects of social information (reviewed by van Teunenbroek et al, 2019) reported a negative effect on the individual donation amount. Four studies (Catt & Benson, 1977;Croson & Shang, 2013;Murphy, Batmunkh, Nilsson, & Ray, 2015;Shang & Croson, 2009) reported no effect: donors donated similar amounts if they did or did not know about the donation of other donors.…”