This is the kind of nonsense Krugman spews. Nobody paid those rates. Revenue collected from the wealthy as a share of their income when rates were 91% was the same as today. Corporations replaced profits and dividends with cash flow and growth of unrealized capital gains. Rich democrat supporters still don't pay income taxes preferring unrealized capital gains to income. That is one reason they call for higher income taxes on the upper middle class and nothing for the super wealthy.