Michael Kinsley has a column up at The Politico in which he claims to debunk a series of Reagan myths. The one that annoys me the most is the one that is obviously and clearly incorrect and at the same time gets the least explanation from Kinsley. Here it is:

6. The Reagan tax cuts paid for themselves because of the Laffer Curve. Please.

With every other “myth” Kinsley takes on, he at least feels the need to explain himself. Not so with the Laffer Curve. I suspect the reason Kinsley doesn’t narrate here is because the slightest bit of examination would reveal that the Laffer Curve is AXIOMATICALLY TRUE.

Too much? No. The Laffer Curve is undeniable. It looks like this:

It is very simple. If you tax at either 0% or 100% you will get nothing because either there is no tax OR the effort of making money is not worth it. You can increase taxes to some optimum point where you will continue to get more revenue up to the point where increased taxation es counterproductive because it causes people to reduce their effort. We observed this phenomenon actually occurring in the United States when we had ultra-high marginal tax rates. Various types of earners curtailed their effort once they hit the magic level at which they would begin to pay the highest rates. They preferred to put off additional activity until the next year. Famously, the detective novels about Nero Wolfe mentioned his tendency to take a few months off at the end of the year because of the top rates of taxation.

Because people react rationally to high rates of taxation, you will realize less revenue because of a reduction in taxable activity. What exactly is Kinsley saying “Please.” about? Does he deny that moving from a 70% tax on the highest earners to a rate in the 30′s or high 20′s could lead to increased revenue as top producers expand their efforts and investments AND stop working so hard to conceal money they have made and otherwise evade taxation? At a lower rate, it is obvious that pliance es a risk much less worth taking.

No, Reagan’s embrace of the Laffer Curve was the most mon sense. And by the way, look at federal revenues after the tax reduction. Real federal revenues increased quite nicely.

The only way the Laffer Curve would be wrong is if one misinterpreted it, as some do. For example, anyone suggesting you would gain more revenue by reducing a 20% tax rate to 10% is probably wrong. But moving out of the prohibitive zone, which is likely anything over 50%, is a shrewd policy decision.