Figure 2
From: Collaborative hierarchy maintains cooperation in asymmetric games
Cooperation during Phase I. Participants’ average PGG contribution as a function of the round number and over the entire phase (inset box) for both experimental treatments. Participants cooperated less in SH treatments, in which individual payoffs determine rank, compared to CH treatments, in which group earnings determine rank. (comparison of SH and CH treatment groups: MW U = 134, **p < 0.002). Error bars represent standard error of the mean over all treatments.
