In fact, Yale economist Robert Shiller, who created the index, says the downward spiral may continue.
An index of ten U.S. metro areas fell 5 percent in August from a year ago. That was the biggest drop since June 1991.
A broader index of 20 metropolitan areas fell 4.4 percent in August compared to a year earlier, with 15 of the 20 reporting that prices were down.
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