Greenspan's an idiot, a fascist, or worse.

A national sales tax? Oh, boy. Just what our out-of-whack economy needs, with the poor, who are growing poorer, and who'd be hit disproportionately with such a tax, bearing the burden of equalizing our federal income and outgo.
The man's got no clue about the need for government to be fair-minded and just in its efforts and impacts. He's a money-monger; he's the first one Christ cast from the temple. He does nothing but crunch numbers and mumble conservative platitudes, while Wall Street and Congress bow and scrape. His solution for fixing imbalances is never to tax the wealthy, but rather to do what comes naturally: tread on those who holler faintest.