from Wired Magazine - The Formula that Sank Wall St

thanks to John Salvey for suggesting this article
clipped from www.wired.com

In the world of mortgages, it's harder still. What is the chance that any given home will decline in value? You can look at the past history of housing prices to give you an idea, but surely the nation's macroeconomic situation also plays an important role. And what is the chance that if a home in one state falls in value, a similar home in another state will fall in value as well?

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