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COMMODITY EXCHANGE: A financial market that trades the ownership of various commodities, such as wheat, corn, cotton, sugar, crude oil, natural gas, gold, silver, and aluminum. The two biggest commodity exchanges in good old U. S. of A. are the Chicago Board of Trade and the Chicago Mercantile Exchange. Unlike, let's say a grocery store where commodities physically trade hands, commodity exchanges trade only legal ownership. This is much like a stock market, which trades the ownership of a corporation, but leaves the factory at home. Commodity markets offer two basic sorts of trading -- spot (immediate delivery of a commodity) and futures (delivery of a commodity at a future date).

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MARGINAL REVENUE PRODUCT

The change in total revenue resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal revenue product, usually abbreviated MRP, is found by dividing the change in total revenue by the change in the variable input or by multiplying marginal physical product by marginal revenue. This is also termed value of the marginal product. Marginal revenue product is a key concept for understanding the demand for productive inputs.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs wanting to buy either a birthday gift for your aunt or a pair of leather sandals that won't cause blisters. Be on the lookout for door-to-door salesmen.
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Two and a half gallons of oil are needed to produce one automobile tire.
"Work is an extension of personality. It is achievement. It is one of the ways in which a person defines himself, measures his worth ‚ and his humanity. "

-- Peter Drucker, author

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