Figure 2
From: Positive interactions may decrease cooperation in social dilemma experiments
Percentage of players by contribution. The percentage of players in each class of contribution (L1, L2, L3, L4, and L5, as defined in the main text) (a) in the homogeneous treatment at even rounds, (b) in the heterogeneous treatment with r = 2 and (b) in the heterogeneous treatment with r = 6. There are more players adopting the Nash solution of no contribution for r = 2 in the heterogenous treatment than in the homogeneous one for most rounds. In addition, fewer players contribute all the initial endowment if r = 2 in the heterogeneous treatment. Notice that for r = 6 in the heterogeneous treatment, there are many players deviating from the Nash solution of full contribution.
