“…Despite overbidding, most studies on group contests find support for the comparative static predictions of the theory. For example, as predicted by the theory, experimental studies find that individual efforts are higher when members of the group are rewarded proportionally to their performance than when they are rewarded equally independent of their performance (Amaldoss et al, 2000;Gunnthorsdottir and Rapoport, 2006;Kugler et al, 2010;Majerczyk et al, 2017). Also, consistent with the theory, behavior of individuals crucially depends on the group impact function, with the perfect-substitutes function generating the highest group effort (Abbink et al, 2010;Ahn et al, 2011;Ke et al, 2013Ke et al, , 2015, the weakest-link function generating the least free-riding (Cason et al, 2012(Cason et al, , 2017Brookins et al, 2018), and the bestshot function generating the highest relative effort by strong players .…”