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Friday, December 19, 2008

Comments

Alex Tolley

While I think the rating agencies failed, I take a contrarian view that it is not all their fault in this case, especially with banks.

There is almost no way they could understand the MBS instruments better than the banks themselves, who clearly didn't understand them (or knew enough to hid the more toxic parts "off balance sheet"). We saw a similar problem in the crash of 1987 when portfolio insurance failed to work as advertised and compounded the decline in prices. Like MBS's today, their volume impacted the market directly, something that could not have been easily predicted quantitatively.

Furthermore, their own ratings will impact the future ratings of the banks, because as the ratings decline, this will instill more counterparty fear incurring deeper fears and credit contraction.

So while I think there is some merit to the idea that other forces that resulted in over optimistic ratings of banks prior to the meltdown, for the most part the agencies are not to blame for ratings situation, nor is the current lowering of ratings unexpected.

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