David Leonhardt and Geraldine Fabrikant write:
In the three decades after World War II, when the incomes of the rich grew more slowly than those of the middle class, the top marginal rate ranged from 70 to 91 percent. Mr. Piketty, one of the economists who analyzed the I.R.S. data, argues that these high rates did not affect merely post-tax income. They also helped hold down the pretax incomes of the wealthy, he says, by giving them less incentive to make many millions of dollars.
Greg Mankiw links to this approvingly under the banner “We Are All Supply-Siders Now.” And it’s true that this is Piketty pointing to a “supply side” effect. On the other hand, the distinctive contention of the supply-siders is that lower taxes on the rich are the key to economic growth. In reality, economic growth was much stronger in the 30 postwar years than in the past 30 years of the low-tax era.
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