What happened next was surprising, in a "What the goddamned $@%! hell just happened?" sort of way: the stock price rose 8%. This is about 1600 basis points more than you would expect. The market had clearly already priced in the risk of a downgrade, and Immelt's statement that the company was prepared to operate as a AA+ company sounded soothing even to me.
This article available online at:
http://www.theatlantic.com/business/archive/2009/03/ge-downgraded/1459/
