But with a global capacity glut in 2001 chemical prices softened, even as raw material costs like natural gas began a fivefold price increase.

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But the spread between the price of the raw material and the price of the finished good is a function of the supply of ethylene-making capacity and the demand for ethylene.

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On Wednesday, Credit Suisse analyst Mark Flannery lowered his year-end forecast for U.S. ethanol capacity to 9.5 billion gallons from 10.0 billion gallons, citing high raw material costs.

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