Thomas Piketty's new book, Capital for the 21st Century, has done a remarkable job of focusing public attention on the growth of inequality in the last three decades and the risk that it will grow further in the decades ahead. Piketty's basic point on this issue is almost too simple for economists to understand: If the rate of return on wealth (r) is greater than the rate of growth (g), then wealth is likely to become ever more concentrated.
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