Specialist Christopher Culhane, left, works with traders on the floor of the New York Stock Exchange dec 5, 2011. World stocks sank Tuesday, Dec. 6, 2011, after Standard and Poor's warned 15 countries using the euro that it could downgrade their credit ratings. Skepticism over a new plan to prevent a breakup of the common currency also dragged markets lower. (AP Photo/Richard Drew)
Read the article: Slow day on the stock market
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