The Laffer Curve is a graphical representation of the relationship between tax rates, tax revenue, and taxable income. It is frequently cited by people who want to explain the common-sense notion that punitive tax rates may not generate much additional revenue if people respond in ways that result in less taxable income.
Unfortunately, some people misinterpret the insights of the Laffer Curve. Politicians, for instance, tend to either pretend it doesn’t exist, or they embrace it with excessive zeal and assume all tax cuts “pay for themselves.”
Another problem is that people assume that tax rates should be set at the revenue-maximizing level. I explained back in 2010 that this was wrong. Policy makers should strive to set tax rates at the growth-maximizing level. But since a growth-generating tax is about as common as a unicorn, what this really means is that tax rates should be set to produce enough revenue to finance the growth-maximizing level of government – as illustrated by the Rahn Curve.
That’s the theory of the Laffer Curve. What about the evidence? Where are the revenue-maximizing and growth-maximizing points on the Laffer Curve?
Well, ask five economists and you’ll get nine answers. In part, this is because the answers vary depending on the type of tax, the country, and the time frame. In other words, there is more than one Laffer Curve.