Today's Economics Lesson - Laying Down the Laws

Previously on this blog we have discussed Hauser's Law, which holds that changes in income tax rates don't meaningfully alter income tax revenues as a percentage of GDP. We have also recently discussed Santelli's Law, which holds that in order to decrease deficits, you must increase GDP. Now, I give you, Thacker's Law. It is as follows:

Increases in tax rates NEVER yield the increases in tax revenues its proponents predict; and decreases in tax rates NEVER yield the reductions in tax revenues its opponents predict.