This combination of Associated Press file photos shows, left, trader Steven Rickard in the S&P 500 futures pit at the CME Group in Chicago near the close of trading, Thursday, May 6, 20

 

              This combination of Associated Press file photos shows, left, trader Steven Rickard in the S&P 500 futures pit at the CME Group in Chicago near the close of trading, Thursday, May 6, 20
This combination of Associated Press file photos shows, left, trader Steven Rickard in the S&P 500 futures pit at the CME Group in Chicago near the close of trading, Thursday, May 6, 2010, and right, an undated handout photo of the "Femme au Grand Chapeau, Buste," by Pablo Picasso. The day before the "flash crash" technical glitch sent stocks nearly 1,000 points down, Thursday, May 6, 2010, Picasso's painting "Woman with the Large Hat, Bust" sold for $9.3 million at Sotheby's. (AP Photo)