Trader Daniel Kryger works on the floor of the New York Stock Exchange Tuesday, April 30, 2013. Stock prices are opening mostly lower on Wall Street as weak earnings from Pfizer and other companies drag down major market averages. (AP Photo/Richard Drew)

Associated Press
Trader Daniel Kryger works on the floor of the New York Stock Exchange Tuesday, April 30, 2013. Stock prices are opening mostly lower on Wall Street as weak earnings from Pfizer and other companies drag down major market averages. (AP Photo/Richard Drew)
Trader Daniel Kryger works on the floor of the New York Stock Exchange Tuesday, April 30, 2013. Stock prices are opening mostly lower on Wall Street as weak earnings from Pfizer and other companies drag down major market averages. (AP Photo/Richard Drew)
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