Diversifying donations is not rational as long as the marginal utility per dollar generated by a charity is affected negligibly by the the small sum you are donating. This assumption seems correct for a large class of utility functions under realistic conditions.
Diversifying donations is not rational as long as the marginal utility per dollar generated by a charity is affected negligibly by the the small sum you are donating. This assumption seems correct for a large class of utility functions under realistic conditions.