There goes the Neighborhood: why home prices are about to plummet--and take the recovery with them.

• Author: Wallace-Wells, Benjamin

In Washington, where words are the currency, where imprecise verbs threaten the loss of a political career and misapplied nouns can doom a movement, there remain a few figures who get a general pass not just for a certain degree of verbal imprecision, but for a fairly deep-seated degree of intellectual wackiness, a penchant for regularly saying very odd things. Newt Gingrich is one of these public figures, Robert Byrd another; Helen Thomas has her moments, too. You'll be sitting in the audience listening to a sensible speech by, say, Gingrich, and all of a sudden you get the notion that aliens have captured his brain. Befuddled, you'll turn to your friend next to you, the libertarian true-believer, and he'll shrug his shoulders and whisper back: "Oh, it's just Newt." And then, a few minutes later, the speaker's episode will subside, the aliens return the brain, and the speech continues on its before-we-were-so-rudely-interrupted track. No one says a word. The capital's press gives these folks a pass from its usual lawyerly scrutiny because they are regarded as sages who can be relied upon to speak some kind of unusual and valuable truth, whose occasional episodes of profound intellectual oddness are thought to stem from the same deep source as their general brilliance.

Perhaps the most powerful figure to benefit from this amnesty is Federal Reserve chairman Alan Greenspan. When Greenspan says something completely wacky and wrong, the press tends to look it over, shrug its shoulders, and say, in effect, "Oh, it's just Greenspan," trusting that during the next moment of national economic crisis the chairman can be relied upon to perform his role as the nations egghead-errant, sent to soothe markets, settle Congress, and help us all see the economic light.

One of these spells flared up during the last week in February, when Greenspan recommended that the home-owning public take a good hard look at switching from fixed-rate mortgages, under whose terms payments stay the same no matter what interest rates do, to adjustable rate mortgages (ARMs), where payments fluctuate along with interest rates--which, right now, makes close to zero sense. Interest rates are lower than they've been in 30 years, and, with all economists predicting a general economic upturn, and Bush's budget deficit and the weak dollar sucking up capital, little doubt exists that interest rates must rise, in which case, switching from a fixed-rate to adjustable-rate mortgage would be pretty costly for any family naive enough to take Greenspan at his word. The episode did not pass completely without critical notice. It was "the strangest bit of advice ever to be proffered by an American central banker," Jim Grant, publisher of Grant's Interest Rate Observer, told the San Francisco Chronicle. Then the press moved on: "Oh, it's just Greenspan."

But sometimes wacko ideas can betray deeper truths. It is tempting to ask what stake the chairman might have in trying to convince millions of people to do something so contrary to their own interest. One theory floated by Fed-watchers is that the chairman is trying to help out his classic institutional constituency, the big banks, which hold trillions of dollars in fixed-rate mortgage paper. There may be something to that theory, but there is almost certainly a deeper and more important motive behind this curious advice. Quite simply, Greenspan is trying to keep a wobbly and fragile recovery alive--and using mortgage refinancing to do it.

There are many strange things about the choppy recovery we're in, but among the most curious is that it is being fueled largely by consumer spending. Why consumers should continue to spend, and why they've done it throughout the recession, is not immediately obvious. After all, average income growth has been puny in the last few years. There's been a big falloff in jobs. Health care and tuition costs have only been going up. And the stock market has spent the last three years unsuccessfully huffing and puffing to get back to the level where it was in early 2001. Why have consumers been spending so much?

Economists have advanced two main reasons. One is that Americans have so lost their moorings that they've had few qualms about going deep into debt. That's certainly true. The average person's debt as a percentage of his income is now higher than it's ever been. But there's another reason, too: Americans have been using their homes as ATM machines, refinancing their mortgages in order to fund their spending. This, of course, makes sense. The one sector of the economy that has consistently swelled has been housing prices. This has intrigued and surprised many economists, because housing is supposed to operate in sync with the economy, expanding during flush times and contracting when things go poorly. But even in a down economy, prices have soared.

Because of these rising prices, people have felt that despite all the ups and downs in stocks and salaries, that their overall situation was okay. Homes are the biggest asset most families own, and their value has been rising nicely. For that reason, Americans have felt more comfortable buying big-ticket items, from SUVs to new computers to Disney World vacations. Much of that...