Ace of Spades HQ: "The time period in that graph encompasses three major revisions of the Internal Revenue Code (1939, 1954 and 1986) that have taken place since the 16th amendment was ratified. During the period, tax rates were all over the map, with top marginal rates as high as 90% at one point, and deductions, exemptions and credits were tinkered with constantly by Congress. But revenue was always constrained at 20% of GDP."Kind of like the speed of
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