Accepting Zero in the Ultimatum Game: Selfish Nash Response?

The study shows that subjects who set their minimum acceptable offer equal to zero in an ultimatum game (UG) are the most generous dictators in a dictator game. The finding implies that interpreting indiscriminately the acceptance of low UG offers as payoff maximization can be misleading and suggests that altruism and/or the desire to maximize welfare are to a large extent behind.