Game or frame? Incentives in modified Dictator Games

We use modified dictator games in which the productivity of taking or giving is varied. Subjects have to decide which of the different games will be payoff relevant in the end. We can show that the behavior of dictators does not depend on the productivity of their gifts, but that their behavior is strongly influenced by the right to choose the relevant game. If the recipients have the right to choose, the dictators become more generous