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italics mine.]
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Both the Kennedy and Mellon tax-cut packages actually lowered overall revenue, relative to a baseline where the tax cuts did not happen. They just increased some receipts from richer families. Take a Congressional Budget Office analysis of the Kennedy-era cuts. No studies "showed that the increased economic activity generated by the tax cut raised revenues and lowered countercyclical transfer payments enough to make the tax-rate reductions self-financing," it wrote in 1978. "Instead, the models showed a net increase in the federal deficit, after three years, of $5 billion to $13 billion," versus models where the tax cuts never took effect. Shorthand: The tax cuts did pay for themselves a little bit by inducing growth, but not nearly enough to pay for themselves entirely.
Moreover, economists stress that tax cuts (and increases, for that matter) hardly work in a vacuum to bring about changes in receipts. Income-tax payments tend to naturally increase year-on-year because of population growth, GDP growth, and inflation. Monetary policy, government spending, and the business cycle also have a major impact. Thus, showing causation becomes a tricky exercise when it comes to taxes. Receipts often climb after tax cuts, but not necessarily because of them."
http://www.slate.com/articles/busin...x_cuts_ever_increase_government_revenues.html
Note: All tax cuts are not the same. There is some rational justification for the Mellon and Kennedy cuts, in spite of the cuts not raising overall revenue. (They were instituted from very high top marginal rates in periods of more restrained Federal spending.) The Reagan and Bush cuts, however, coming at a time of huge increases in federal spending, were disastrous for their long range effect on the economy. In each of the latter two cases the economy was stimulated by large increases in government spending and borrowing following the cuts, however the long term result was massive debt.