Those in the richest countries have far more income and wealth than those in poor countries. Moreover, the most fortunate in the richest countries – particularly those in the top centile of the income distribution – are far richer than those around them. Most dramatically, even within that...

Development economists have long debated the proper targets for foreign aid contributions from wealthy countries. Philosophers like Peter Singer and Peter Unger now suggest that these countries' citizens have a parallel moral responsibility to tithe a portion of their income directly for the...