In economics, the Laffer curve illustrates a theoretical relationship between rates of taxation and the resulting levels of the government’s tax revenue. The Laffer curve assumes that no tax revenue is raised at the extreme tax rates of 0% and 100%, meaning that there is a tax rate between 0% and 100% that maximizes government tax revenue.
A basic representation of a Laffer curve, plotting government revenue (R) against the tax rate (t) and showing the maximum revenue at t*
The shape of the curve, a fascinating subject of ongoing debate among economists, is a function of taxable income elasticity—i.e., taxable income changes in response to changes in the rate of taxation. As popularized by supply-side economist Arthur Laffer, the curve is typically represented as a graph that starts at 0% tax with zero revenue, rises to a maximum revenue rate at an intermediate rate of taxation, and then falls again to zero revenue at a 100% tax rate. However, the shape of the curve is uncertain and disputed among economists.
One implication of the Laffer curve is that increasing tax rates beyond a certain point is counter-productive for raising further tax revenue. However, the hypothetical maximum revenue point of the Laffer curve for any given market cannot be observed directly and can only be estimated, leading to intense and often controversial debates. According to The New Palgrave Dictionary of Economics, estimates of revenue-maximizing income tax rates have varied widely. The shape of the Laffer curve may also differ between different global economies. The Laffer curve was popularized in the United States with policymakers following an afternoon meeting with Ford Administration officials Dick Cheney and Donald Rumsfeld in 1974, in which Arthur Laffer reportedly sketched the curve on a napkin to illustrate his argument. The term “Laffer curve” was coined by Jude Wanni Ski, who was also present at the meeting. The basic concept was not new; Laffer notes antecedents in the writings of the 14th-century social philosopher Ibn Khaldun and others.
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