| Abstract: | The Laffer curve shows the relationship between tax revenue and the personal income tax rate, with tax revenue being a presumably concave function of the tax rate and equal to zero at tax rates of zero percent and 100 percent. If the personal income tax rate is reduced, then tax revenue will decrease (increase) if the economy is on the positively (negatively) sloped section of the Laffer curve. This paper derives a sufficient condition for the economy to be on the positively sloped section of the Laffer curve. In light of the current knowledge of the elasticities of supply of labor and supply of saving, it is difficult to escape the conclusion that a decrease in U.S. personal income tax rates will decrease tax revenue. |
