We characterize the class of symmetric two-player games in which tit-for-tat cannot be beaten even by very sophisticated opponents in a repeated game. It turns out to be the class of exact potential games. More generally, there is a class of simple imitation rules that includes tit-for-tat but...

We show that for many classes of symmetric two-player games, the simple decision rule 'imitate-if-better' can hardly be beaten by any strategy. We provide necessary and sufficient conditions for imitation to be unbeatable in the sense that there is no strategy that can exploit imitation as a...

The tax incidence of different price-point instant lottery games is examined. Theoretical reasons exist for expecting higher-priced instant lottery games to be less regressive than lower-priced instant games. Using game-level data from a sample of states, the empirical results show that...