Unfortunately for supply-siders, history has proven them wrong again and again. During almost three decades spanning 1951 to 1980, when America's top marginal tax rate was between 70 and 92 percent, the nation's average annual growth was 3.7 percent. But between 1983 and start of the Great Recession, when the top rate was far lower -- ranging between 35 and 39 percent -- the economy grew an average of just 3 percent per year. Supply-siders are fond of claiming that Ronald Reagan's 1981 cuts caused the 1980s economic boom. In fact, that boom followed Reagan's 1982 tax increase. The 1990s boom likewise was not the result of a tax cut; it came in the wake of Bill Clinton's 1993 tax increase.
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