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For those who don't fully understand how ratings agencies matter: some investors (corporations, mutual funds, pension funds, etc) have very specific rules about what they can invest in. So for a pension fund maybe the manager can only invest in AAA bonds. That means with the US Treasury bonds being downgraded to AA+, some investors will be legally obligated to sell their holdings (this is minimized because it's only one ratings agency).
In the buildup to the subprime crisis investment banks did all they could to bend and cheat to get AAA ratings for all of their junk so they could unload it on foreign pension funds with these holding requirements. The banks made the securities so complicated and obscure that even the investors didn't really understand them; most people saw the "AAA" and trusted the agencies. This of course turned out to be a bad idea.
Moody's and S&P (the two biggest agencies) are filled with all of the finance graduates who weren't smart or impressive enough to get a lucrative job at one of the investment banks. Their advice follows the market- not the other way around. Nobody on Wall Street respects them, they just need their rubber stamp for their securities.
Ratings agencies were crucial to the financial crisis. President Obama signed the Wall Street Reform act, which (heaven forbid!) allows investors to sue the agencies for bad advice. I think they want retribution now. It's absolutely ridiculous that during the debt ceiling debate all three of the big agencies were coming out and saying what WOULD or WOULDN'T lead to a downgrade. If all three agencies were to downgrade US debt that would be bad news, and so they have an opportunity to more or less extort the US government. Some reforms need to be made.
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