We use introspection dynamics 38 , 39 to model how people learn to cooperate in the three treatments. Here, we show average cooperation rates for both the high and the low game over time, averaged over 100 simulations. In the control treatment, there is substantially more cooperation in the high game than in the low game, as expected. In the same-partner treatment, players are generally more cooperative, whereas in the different-partners treatment, players tend to cooperate less.
