A Dearth of Taxes?

This article, published by RealClearPolitics, quotes Bret Swanson of Discovery Institute:

As Discovery Institute senior fellow Bret Swanson recently wrote, there is a “remarkable tendency for Federal revenues to hover around 18% of GDP (and for personal income tax revenue to gather between 7.5 and 9% of GDP), no matter if tax rates are high or low.”

The rest of the article can be found here.