The "shadow" inventory of homes — those that have been repossessed or are headed for foreclosure, which traditional supply measures do not capture — jumped 55% from a year earlier, to 1.7 million on Sept. 30, First American CoreLogic said.

By contrast, "visible supply" — homes that are on the market — dropped 19%, to 3.8 million units, over the same period, the unit of First American Corp. of Santa Ana, Calif., said last week.

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