Case-Shiller index: Home prices virtually flat in August

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

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.