Supply-side economics
Economist Arthur Laffer supported supply-side economics with a theory called a Laffer Curve.  The theory stated that government will get no money if taxes were too high—nobody would pay them—and that the government would not get enough money if taxes were too low.  The theory also stated that if taxes were too high, the economy would be less productive and it would give the government less money and that if taxes were low, the economy would be productive and the government would get more money.