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Commodities futures contracts, such as those connected to grains and metals, experience huge price swings because of the supply-and-demand dynamic and market speculation. Corn, for instance, traded as high as $7.96 a bushel in June 2008 during the height of the ethanol craze. By December 2008 it was down to $3.06, as commodities went from boom to bust.

»Article: Variety Begets Vitality

Photo: AP