Wall Street

  FILE - In this Tuesday, Oct. 9, 2012, file photo, a Chevron station posts gasoline prices starting at $5.50 per gallon in downtown Los Angeles. Shares of Chevron Corp. plunged Wednesday after the oil giant said its third-quarter earnings are expected to be "substantially lower" than in the second quarter. (AP Photo/Reed Saxon, File)
FILE - In this Tuesday, Oct. 9, 2012, file photo, a Chevron station posts gasoline prices starting at $5.50 per gallon in downtown Los Angeles. Shares of Chevron Corp. plunged Wednesday after the oil giant said its third-quarter earnings are expected to be "substantially lower" than in the second quarter. (AP Photo/Reed Saxon, File)

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