Case-Shiller index: Home prices virtually flat in August

Only Detroit, Washington, D.C., post annual increases among 20 markets

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U.S. home prices stayed virtually flat in August compared to July and fell compared to a year ago, according to the latest Standard & Poor’s/Case-Shiller Home Price Indices.

While Case-Shiller’s 20-City Composite saw its fifth monthly rise in August, the month’s increase was a slight one, at 0.2 percent. The index fell 3.8 percent compared to August 2010.