Many commentators swooned earlier this week after House Republicans, led by the Budget Committee chairman, Paul Ryan, unveiled their budget proposals. They lavished praise on Mr. Ryan, asserting that his plan set a new standard of fiscal seriousness.

 

Well, they should have waited until people who know how to read budget numbers had a chance to study the proposal. For the G.O.P. plan turns out not to be serious at all. Instead, it’s simultaneously ridiculous and heartless.

 

How ridiculous is it? Let me count the ways — or rather a few of the ways, because there are more howlers in the plan than I can cover in one column.

 

First, Republicans have once again gone all in for voodoo economics — the claim, refuted by experience, that tax cuts pay for themselves.

 

Specifically, the Ryan proposal trumpets the results of an economic projection from the Heritage Foundation, which claims that the plan’s tax cuts would set off a gigantic boom. Indeed, the foundation initially predicted that the G.O.P. plan would bring the unemployment rate down to 2.8 percent — a number we haven’t achieved since the Korean War. After widespread jeering, the unemployment projection vanished from the Heritage Foundation’s Web site, but voodoo still permeates the rest of the analysis.

 

In particular, the original voodoo proposition — the claim that lower taxes mean higher revenue — is still very much there. The Heritage Foundation projection has large tax cuts actually increasing revenue by almost $600 billion over the next 10 years.

 

A more sober assessment from the nonpartisan Congressional Budget Office tells a different story. It finds that a large part of the supposed savings from spending cuts would go, not to reduce the deficit, but to pay for tax cuts. In fact, the budget office finds that over the next decade the plan would lead to bigger deficits and more debt than current law.

 

And about those spending cuts: leave health care on one side for a moment and focus on the rest of the proposal. It turns out that Mr. Ryan and his colleagues are assuming drastic cuts in nonhealth spending without explaining how that is supposed to happen.

 

How drastic? According to the budget office, which analyzed the plan using assumptions dictated by House Republicans, the proposal calls for spending on items other than Social Security, Medicare and Medicaid — but including defense — to fall from 12 percent of G.D.P. last year to 6 percent of G.D.P. in 2022, and just 3.5 percent of G.D.P. in the long run.

 

That last number is less than we currently spend on defense alone; it’s not much bigger than federal spending when Calvin Coolidge was president, and the United States, among other things, had only a tiny military establishment. How could such a drastic shrinking of government take place without crippling essential public functions? The plan doesn’t say.

 

And then there’s the much-ballyhooed proposal to abolish Medicare and replace it with vouchers that can be used to buy private health insurance.

 

The point here is that privatizing Medicare does nothing, in itself, to limit health-care costs. In fact, it almost surely raises them by adding a layer of middlemen. Yet the House plan assumes that we can cut health-care spending as a percentage of G.D.P. despite an aging population and rising health care costs.

 

The only way that can happen is if those vouchers are worth much less than the cost of health insurance. In fact, the Congressional Budget Office estimates that by 2030 the value of a voucher would cover only a third of the cost of a private insurance policy equivalent to Medicare as we know it. So the plan would deprive many and probably most seniors of adequate health care.

 

And that neither should nor will happen. Mr. Ryan and his colleagues can write down whatever numbers they like, but seniors vote. And when they find that their health-care vouchers are grossly inadequate, they’ll demand and get bigger vouchers — wiping out the plan’s supposed savings.

 

In short, this plan isn’t remotely serious; on the contrary, it’s ludicrous.

 

And it’s also cruel.

 

In the past, Mr. Ryan has talked a good game about taking care of those in need. But as the Center on Budget and Policy Priorities points out, of the $4 trillion in spending cuts he proposes over the next decade, two-thirds involve cutting programs that mainly serve low-income Americans. And by repealing last year’s health reform, without any replacement, the plan would also deprive an estimated 34 million nonelderly Americans of health insurance.

 

So the pundits who praised this proposal when it was released were punked. The G.O.P. budget plan isn’t a good-faith effort to put America’s fiscal house in order; it’s voodoo economics, with an extra dose of fantasy, and a large helping of mean-spiritedness.

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