| http://www.w3.org/ns/prov#value | - But aside from naming a handful of highly-rated collateralized debt obligations (bonds derived from other bonds that were mostly backed by mortgages) that quickly defaulted in 2007, the complaint never explains what makes a rating good or how to know when ratings are defective.A paper last year by Philly Federal Reserve economists estimates that 727 CDOs issued between 1999 and 2007 with a face va
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