Incomes lagging behind home values

The widening gap in all but a handful of the nation's 500 largest cities helped make the recent boom in housing prices unsustainable, according to analysts. The rising prices were fueled largely by low interest rates and risky borrowing, rather than increasing incomes.

"We had an artificial economy," said Brad Geisen, founder of Foreclosure.com, a Web site that lists foreclosure properties. "There was all this wealth created in real estate, and it wasn't really created."

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