Laffer curve

noun Laf·fer curve \ ˈlafər- \
Updated on: 13 Oct 2017

Definition of Laffer curve

:a diagram shaped like a normal curve that is intended to show the relationship between tax rates and tax revenues

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Origin and Etymology of laffer curve

after Arthur Laffer, born 1940 American economist


Financial Definition of LAFFER CURVE

Laffer curve

What It Is

The Laffer curve is a graphic representation of the relationship between an increasing tax rate and a government's total revenues. The relationship suggests that revenues decline beyond a peak tax rate.

How It Works

Named for its creator, economist Arthur Laffer, the Laffer curve has a parabolic shape plotted on a graph: Government revenue is displayed on the vertical axis, and the tax rate appears on the horizontal axis.

laffer curve example chart

The shape of the Laffer curve suggests that government revenues diminish with tax rate increases beyond an optimal level denoted as T*. This is based on the theory that beyond a certain tax rate, a country's taxpayers will have a decreasing incentive to work knowing that more and more of their money is being taken by the government. In other words, according to this model, at tax rates approaching 100%, taxpayers will work little, if at all.

Why It Matters

According to the Laffer curve, a government that wishes to maximize tax revenues must determine its optimal tax rate. Many economists have indicated that this can only be estimated for practical purposes.


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