Figure 2 : Contributions in the PGG were maintained when participants knew their neighbours’ previous PGG contributions during the pairwise PD stage.

From: Think global, act local: Preserving the global commons

Figure 2

(a) PGG contributions were maintained at high levels in the treatment condition when participants were informed of their neighbours’ previous PGG contributions. Conversely, in the control condition, the level of contributions in the group cooperation stage decreased quickly over time. (b) In the pairwise stage, the level of cooperation did not differ between the control and treatment conditions, but the ways in which the pairwise PDs were used differed substantially (see Fig. 3). (Upper and lower bounds are +/− robust standard errors from the mean clustered on session).