FILE – This Aug. 13, 2010 photo shows a sign for Moody's Corp. in New York. Moody's Investors Service upgraded the outlook for U.S. government debt to “stable” from “negative” and affirmed the United States’ blue chip Aaa rating on Thursday, July 18, 2013. The rating agency cited a surprising drop in the federal deficit – the difference between what the government collects in taxes and what it spends. The U.S. government is on track to report its lowest annual deficit in five years. (AP Photo/Mark Lennihan)