Impure altruism in dictators' giving

We design an experiment to test whether incomplete crowding out in dictator games can be rationalized by the impurely altruistic preferences. By giving the recipients an endowment of varying levels, we create an environment in which crowding out may occur. We find that the behavior of 66% of the dictators can be rationalized by the impurely altruistic utility function.

► We test whether impurely altruistic utility can rationalize dictators' choices.
► We give the recipients an endowment of varying levels.
► Varying endowment creates an environment in which crowding out may occur.
► Impurely altruistic utility rationalizes 66% of the dictators.