jmfcst's 9% flat or the 1960 tax code?

[bullmoose88]

there were tons of loopholes back then, so no one paid those rates....the simple fact is that since 1960, the tax base has shrunk and the rich have been carrying more and more of the load....this is true even since 1986.

jmfcst employs counterfactuals.

He's right.  That's the reason we (still) have the AMT, and why the AMT was enacted around then too.