The government letting people and corporations keep more of what they earn shouldn't have to "pay for itself" because it's not the government's money to begin with.
Quote from Ricter:
I agree, the vast majority of economists do say that tax cuts do not pay for themselves, but do any of them, did Greenspan, mean to say they NEVER pay for themselves? As you have been trying to point out, it's where the cuts fall that's most important. So, some tax cuts, in some circumstances, would pay for themselves.

