Once everyone who gives is acting on the principle of “give each marginal charitable dollar so it does the most good”, then you can worry about diversification, and only then if you’re sure that the total contributions by everyone are actually over-concentrated.
Once everyone who gives is acting on the principle of “give each marginal charitable dollar so it does the most good”, then you can worry about diversification, and only then if you’re sure that the total contributions by everyone are actually over-concentrated.