I particularly like Paul Krugman’s comment on S&P
More broadly, the rating agencies have never given us any reason to take their judgments about national solvency seriously. It’s true that defaulting nations were generally downgraded before the event. But in such cases the rating agencies were just following the markets, which had already turned on these problem debtors.
And in those rare cases where rating agencies have downgraded countries that, like America now, still had the confidence of investors, they have consistently been wrong. Consider, in particular, the case of Japan, which S.& P. downgraded back in 2002. Well, nine years later Japan is still able to borrow freely and cheaply. As of Friday, in fact, the interest rate on Japanese 10-year bonds was just 1 percent.
So there is no reason to take Friday’s downgrade of America seriously. These are the last people whose judgment we should trust.