Imagine you are planning to make a charitable donation and want your gift to make a real difference. You’ve done your research and found three very effective programs: one provides cash transfers to increase the incomes of very poor households; one provides treatment to correct clubfoot, a congenital condition that causes pain and mobility loss; and one provides children with medication to prevent illness and death from malaria. How do you decide? Like GiveWell, you may aim to maximize the ...