Fig. 1
From: Social identity and cooperation co-evolve in a multilevel public goods game
The group structure of the game as described to the participants. Participants play in a global group of 6 (Allshire) as well as in their own local group of 3 (Westville). Each round involves simultaneous threshold public goods games played at both the global and local level. The threshold for the global group is 4 investors, while the threshold for each local group is 2 investors. The Global Only condition has the same group structure but participants do not have the option to invest in the local groups.
