Home prices in 20 major U.S. cities have dropped 15.3% in the past year, according to the Case-Shiller home price index released Tuesday by Standard & Poor's. Prices were down 16.3% in a smaller subset of 10 homes that have been tracked over a longer period. Home prices fell in 12 of 20 cities in April compared with March, but are down in all 20 cities compared with a year earlier. Prices are now down 17.8% from the peak two years ago. The Case-Shiller index tracks sales of the same homes over time, so it's not influenced by the mix of homes sold in a period
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