How much are we morally required to do to help people who are much worse off than us? Philosophers have often raised this question in assessing the plausibility of particular moral theories. But it is a pressing question whatever one's moral outlook. Any plausible moral outlook should recognize requirements of beneficence -- requirements grounded directly in other people's need for assistance. Given this, there is a forceful case for thinking that we are morally required -- not only collectively, but also as individuals -- to devote a substantial proportion of what we have to helping the...