Krugman’s nearly always good, but this column is simply superb–a reader who started the column not knowing a blessed thing about ratings agencies would, by the end, understand what they do, what the problems with them are (93% of mortgage-backed securities given AAA ratings in 2006 are now junk, which I didn’t know), and what to do about them, both in general and a specific possible action. Seriously. Go read it.
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