Nyse

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Trader Peter Tuchman works on the floor of the New York Stock Exchange on Aug. 10, 2011. (Associated Press)

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Specialists Donald Vaneck (center) and Robert Tuccillo work on the floor of the New York Stock Exchange on Aug. 9, 2011. (Associated Press)

A television screen at the post of specialist Stephen Ruiz (left) displays the decision of the Federal Reserve on the floor of the New York Stock Exchange on Aug. 9, 2011. The Federal Reserve said Tuesday that it will likely keep interest rates at record lows for the next two years after acknowledging that the economy is weaker than it had thought and faces increasing risks. (Associated Press)

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A Wall Street sign hangs near the New York Stock Exchange in New York. (AP Photo/Jin Lee)

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Traders work on the floor of the New York Stock Exchange on Aug. 8, 2011. (Associated Press)

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Traders work on the floor of the New York Stock Exchange on Aug. 8, 2011. (Associated Press)

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**FILE** Pedestrians walk past a Wall Street sign near the New York Stock Exchange. (Associated Press)

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A trader works on the floor of the New York Stock Exchange on Thursday, Aug. 4, 2011, in New York. (AP Photo/Jin Lee)

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Trader Sal Saurino works on the floor of the New York Stock Exchange on Monday. There had been hope for a rally based on news of a debt-ceiling agreement on Capitol Hill. (Associated Press)

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Specialist James Ahrens works on the floor of the New York Stock Exchange on Aug. 1, 2011. (Associated Press)

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Trader Warren Meyers works on the floor of the New York Stock Exchange on July 29, 2011. (Associated Press)

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In this July 26, 2011, photo, traders work on the floor of the New York Stock Exchange, in New York. Global stocks were weighed down again on Wednesday, July 27, by worries that the U.S. could default on its debt or see its credit rating cut as lawmakers in the world's largest economy appear no nearer to agreeing on raising the borrowing limit. (AP Photo/Henny Ray Abrams)

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Christopher Ruiz (right) of Banc of America Specialist, Inc., and a fellow trader work on the floor of the New York Stock Exchange on July 26, 2011. (Associated Press)

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Traders work on the floor at the New York Stock Exchange on July 25, 2011. (Associated Press)

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**FILE** In this photo from June 27, 2011, traders work on the floor at the New York Stock Exchange in New York. (Associated Press)

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Specialist Jason Blatt (center) calls out prices for Pandora Media Inc. as it begins trading on the floor of the New York Stock Exchange on Wednesday. The IPO closed at $17.42, a gain of 8.9 percent. (Associated Press)

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Trader Christopher Morie works on the floor of the New York Stock Exchange on June 7, 2011. (Associated Press)

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Jeff Weiner (second from right), LinkedIn's CEO, celebrates the company's listing on May 19, 2011, at the New York Stock Exchange. LinkedIn, based in Mountain View, Calif., is an internet-based social networking rolodex for business people. (Associated Press)

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A trader laughs as he works May 12 with colleagues on the floor of the New York Stock Exchange. A loss of momentum on Wall Street, dropping commodity prices and worries over Europe's debt problems caused world stock markets to sag Monday. (Associated Press)