Delaying acceptance decisions in the Ultimatum Game drastically increases acceptance of low offers. While in treatments without delay less than 20% of low offers are accepted, 60-80% are accepted as we delay the acceptance decision by around 10 min.

We conduct a laboratory experiment and provide evidence of learning spillovers within and across equivalence classes of “structurally similar” games. These spillovers are inconsistent with existing theories of learning in games.