YESTERDAY the White House published a chart that explains how we got from the Clinton administration projection that the government would pay off its entire debt and then build up $2.3 trillion in savings by 2011, to the $10.4 trillion in debt we actually wound up with. Of that $12.7 trillion shift, the Bush tax cuts account for $3 trillion. James Fallows explains: "As the figures demonstrated, the Bush-era tax cuts, extended last year under Obama, were the biggest single policy source of deficit increase over the past ten years. Therefore you can be for reducing deficits, or you can be for preserving the tax cuts, but you cannot rationally be for both."

I think there's something else we need to look at in this chart. It's the very first item at the top of the chart's right-hand column: the shift in the debt profile that resulted from no policy change at all, but from "Economic and technical changes (eg, lower tax revenues due to recession)". It's $3.6 trillion.

In other words, that massive surplus pile of government savings, or sovereign wealth, or whatever you want to call it, simply never existed.* The Clinton administration's calculations in 2000 that the government would pay off its debt and accumulate savings of $2.3 trillion over the following ten years were wrong. And they were wrong not because of any stupid error or dramatically incorrect theory about the economic world, but simply because they failed to predict that the American economy would experience a financial crisis in 2008, followed by the worst recession since the Great Depression and a historically anaemic recovery. (I assume they failed to predict the 2001 tech-crash recession as well.) The Clinton administration delivered a couple of years of real verifiable budget surpluses in the late 1990s, and if Clintonian levels of taxation and spending had continued, they likely would have generated annual surpluses that would have shrunk the debt by over $2 billion over the decade thereafter. But the forecast that they would have eliminated the debt entirely and replaced it with trillions of dollars in sovereign wealth was a mirage.

This isn't particularly surprising; we simply don't know how to make long-term projections about the economy or government revenues that don't have trillions of dollars worth of error margin on either side. Which is why we need to be careful about budgeting and get our tax rates and our spending more or less in balance over the long term, running surpluses in good years and deficits in bad ones. The Bush tax cuts did the opposite: $3 trillion worth of tax cuts were predicated on the premise that we were returning the people "their" money. As it turned out, the money wasn't there to return. Even without the tax cuts, the wars, or anything else, the government would have entered 2011 with $1.3 trillion in debt, not $2.3 trillion in savings. Basically, in the grip of careless enthusiasm about the economic future, we borrowed $3 trillion from bond markets and handed it out to citizens in rough proportion to how rich they already were. In the middle of a recovery. This is not a useful thing for the government to do.

* I've changed the wording in this paragraph to avoid any potential reader confusion between annual budget surpluses, which Clinton-style budgets would have generated, versus an overall buildup of sovereign wealth rather than debt, which they wouldn't have. (Incidentally, the fact that we don't even have a readily available word for a buildup of sovereign wealth in the vocabulary we normally use to talk about the American government seems kind of worth noting.) Additionally, I realise that if we hadn't had the Bush tax cuts, the entire economic story of the past decade could be different; perhaps we wouldn't have had the financial crisis. Or maybe we would have anyway. I don't know, and I think that takes things too far. What I'm trying to say in this post is that when you get a budget forecast that says, hey, over the next ten years we're going to pay off our entire debt and then some, you shouldn't go rushing out to spend the money on massive decade-long multi-trillion-dollar tax cuts. Ten-year economic forecasts are not very accurate. Not to mention the fact that your decade-long tax cut will be very hard to repeal at the end of the decade.