NO, VIRGINIA, THERE IS NO SUPPLY-SIDE SANTA CLAUS

I noted before that 3 conservative economists think that Laffer's supply-side theory is voodoo economics but it's nice to get a little more evidence, this time from Martin Wolf of the Financial Times.

The political genius of supply-side economics
July 25, 2010 4:18pm

True, the theory that cuts would pay for themselves has proved altogether wrong. That this might well be the case was evident: cutting tax rates from, say, 30 per cent to zero would unambiguously reduce revenue to zero. This is not to argue there were no incentive effects. But they were not large enough to offset the fiscal impact of the cuts (see, on this, Wikipedia and a nice chart from Paul Krugman).

Indeed, Greg Mankiw, no less, chairman of the Council of Economic Advisers under George W. Bush, has responded to the view that broad-based tax cuts would pay for themselves, as follows: “I did not find such a claim credible, based on the available evidence. I never have, and I still don’t.” Indeed, he has referred to those who believe this as “charlatans and cranks”. Those are his words, not mine, though I agree. They apply, in force, to contemporary Republicans, alas,

Since the fiscal theory of supply-side economics did not work, the tax-cutting eras of Ronald Reagan and George H. Bush and again of George W. Bush saw very substantial rises in ratios of federal debt to gross domestic product. Under Reagan and the first Bush, the ratio of public debt to GDP went from 33 per cent to 64 per cent. It fell to 57 per cent under Bill Clinton. It then rose to 69 per cent under the second George Bush. Equally, tax cuts in the era of George W. Bush, wars and the economic crisis account for almost all the dire fiscal outlook for the next ten years (see the Center on Budget and Policy Priorities).