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WASHINGTON (Reuters) - Whether it's a national bubble or just pockets of regional froth, an end to surge in home prices could inflict economic harm that would make the 2000 tech bust look tame in comparison.
Even if the market cools in only those parts of the country that Federal Reserve Chairman Alan Greenspan describes as "frothy," the U.S. has a serious problem.
If prices were merely to level off, it could subdue the property-linked activity that has stimulated spending and job growth -- crucial supports for the U.S. economy.
Based on benchmarks from a recent International Monetary Fund study comparing the stock and housing market bubbles, there are about 15 markets that are vulnerable to a housing market correction. These represent about 35 percent of gross domestic product, the broadest measure of the nation's economy.
"A significant correction in consumption spending in these states is bound to have significant effects on national growth," said Thomas Helbling, an economist at the IMF in Washington.
Merrill Lynch estimates the impact on growth could be as much as one percentage point of gross domestic product.
Add the knock-on effects to the rest of the economy to any initial spending hit and the situation looks worse.
The IMF study found that while stock market collapses are more frequent, housing busts do a lot more damage.
"The output loss associated with the typical housing price bust (about 8 percent of GDP) was twice as large as that associated with a typical equity price bust," the study said.
Fed hot rhetoric
The Federal Reserve understands these risks, which is why its top officials have talked of revamping lending guidelines to reduce speculation.
"They are certainly well aware of the fact that what is going on in the housing market could predispose toward problems down the road. And to the extent that they could avoid it, without upsetting the economy currently, they would certainly like to do that," said former Fed Governor Lyle Gramley.
The situation calls for more gradual interest-rate rises, since stopping now would only further fuel the housing boom, he said.
When it raised rates Thursday for the ninth straight time in a year, the Fed, the nation's central bank, gave no indication it was prepared to stop in the near future.
A look at the U.S. economy's reliance on the housing sector in recent years is helpful in gauging the impact of a serious market upset.
American households have enjoyed a $4 trillion rise in wealth, thanks to a 40 percent gain in house prices since early 2001, according to Merrill Lynch.

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