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Morning Movers: Alcoa Soars, American Express Jumps, iRobot Gains

Stocks are heading for a lower open this morning as commodity prices rally. The Nasdaq Composite has dropped 0.3% to 7,273.79. BofA Merrill Lynch's Paul Ciana, meanwhile, writes that "our base case view of the Thomson Reuters equal weight commodity index (CCI) suggests commodity markets are on the verge of signaling a secular bull trend." But a word of warning--some commodities could be nearing a pause.