Critics of globalization point out that billions haven't benefited much, if at all, from all this economic prosperity, and that the polarization of wealth is growing, both within and across nations. And those criticisms are valid, and they are troubling. But they aren't new. Disparities between those who have more and those who have less have existed pretty much from the moment agriculture enabled us to accumulate a surplus. At some times, this inequality has been a big concern, as it was with Jesus and with Muhammad. At other times, not so much. Inequalities are as old as human history, and almost as old as the debate about them.