One of the mysteries of the financial crisis is how mortgage investments that turned out to be so bad earned credit ratings that made them look so good.
One answer is that Wall Street was given access to the formulas behind those magic ratings — and hired away some of the very people who had devised them.
In essence, banks started with the answers and worked backward, reverse-engineering top-flight ratings for investments that were, in some cases, riskier than ratings suggested, according to former agency employees.
The major credit rating agencies, Moody's, Standard & Poor's and Fitch, drew renewed criticism on Friday on Capitol Hill for failing to warn of the dangers posed by complex investments like the one that has drawn Goldman Sachs into a legal whirlwind.
rest http://www.nytimes.com/2010/04/24/business/24rating.html?th&emc=th
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