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Finance Dictionary and Glossary of Investment Terms
A loose quantity term sometimes used to describe the amount of a commodity underlying one commodity contract; e.g., "a car of bellies." Derived from the fact that quantities of the product specified in a contract once corresponded closely to the capacity of a railroad car.
The amount of a commodity underlying a commodity futures contract. The term originates from the railroad cars that used to carry the commodities, but today the term is also used for futures on stock indices and other intangibles.