The intelligentsia of the Democratic Party is growing increasingly enthusiastic about raising the highest federal income tax rates to 70% or more. Former Labor Secretary Robert Reich took the lead in February, proposing on his blog “a 70 percent marginal tax rate on the rich.” After all, he noted, “between the late 1940s and 1980 America’s highest marginal rate averaged above 70 percent. Under Republican President Dwight Eisenhower it was 91 percent. Not until the 1980s did Ronald Reagan slash it to 28 percent.”

That helped set the stage for Rep. Jan Schakowsky (D., Ill.) and nine other House members to introduce the Fairness in Taxation Act in March. That bill would add five tax brackets between 45% and 49% on incomes above $1 million and tax capital gains and dividends at those same high rates. The academic left of the Democratic Party finds this much too timid, and would rather see income tax rates on the “rich” at Mr. Reich’s suggested levels—or higher.

However, the individual income tax actually brought in less revenue when the highest tax rate was 70% to 91% than it did when the highest tax rate was 28%.

In short, reductions in top tax rates under Presidents Kennedy and Reagan, and reductions in capital gains tax rates under Presidents Clinton and George W. Bush, not only “paid for themselves” but also provided enough extra revenue to finance negative income taxes for the bottom 40% and record-low income taxes at middle incomes.

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