Nudging Cooperation in a Crowd Experiment
Fig 2
Dimensional histogram of the number of points scored by each player.
In the first round (left panel) the distribution is clustered close to the origin showing that players rarely score more than 2 points. In the second round (right panel) the majority of dyads show that both players win 5 or 6 points (11 was the maximal amount of points they could accumulate).