U.S. housing prices will fall by a double-digit percentage from already beaten-down levels, resulting in an overall 40 percent plunge by the time foreclosures peak in the second half of 2010, Barclays Capital economist Michelle Meyer said.

Meyer issued her forecast two days after the Standard & Poor's/Case-Shiller Home Price Indexes showed for April an 18.1 percent year-to-year decline, compared with 18.7 percent in March, in the rate of home price declines in 20 major U.S. metropolitan areas.

The indexes have tracked the prices of U.S. single-family homes since 1987.

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