The Powershares DB Commodity Index Tracking Fund ( DBC) is a widely followed and liquid ETF that tracks the changes in the Deutsche Bank Liquid Commodity Index.

FORBES: One High-Yielding Commodity Play

Goldman, then, began trading in commodities, set up a fund and an index (Goldman Sachs Commodity Index) consisting of cattle, coffee, corn, wheat, cocoa, etc.

FORBES: Commodity Bubble Redux In Full Effect