WASHINGTON, DC - AUGUST 23: Former Federal Reserve Bank Chairman Alan Greenspan participates in a question-and-answer session as part of the keynote program at the Innovation Nation and Government ... more 
WASHINGTON, DC - AUGUST 23: Former Federal Reserve Bank Chairman Alan Greenspan participates in a question-and-answer session as part of the keynote program at the Innovation Nation and Government Open Source Conference at the Washington Convention Center August 23, 2011 in Washington, DC. Having served as the Fed chairman from 1987 to 2006, Greenspan said last week that the S&P downgrade of the U.S. credit rating damaged the "psyche" of the country but that there is no risk in investing in U.S. treasury bonds. (Photo by Chip Somodevilla/Getty Images) less 
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Getty Images | Photo By Chip Somodevilla / Getty Images
Tue, Aug 23, 2011 9:42 AM EDT