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OPEC: The common abbreviation for the Organization of Petroleum Exporting Countries, which is an international organization of more than a dozen nations located primarily in the Middle East, Africa, and Central America that controls a sizeable portion of the world's petroleum reserves. This control over oil reserves gives OPEC significant market control, which it has been inclined to exert from time to time. The most noted time was the 1970s. OPEC raised oil prices from a scant $2 to $3 a barrel in the early 1970s to over $30 a barrel by the end of the decade. As an group of independent oil-producing nations seeking to monopolize the market, OPEC represents a textbook example of an cartel.

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AVERAGE-MARGINAL RELATION

A mathematical connection between a marginal value and the corresponding average value stating that the change in the average value depends on a comparison between the average and the marginal. This mathematical relation between average and marginal surfaces throughout the study of economics, especially production (average product and marginal product), cost (average total cost and marginal cost), and revenue (average revenue and marginal revenue). A similar relation is that between a total value and the corresponding marginal value.

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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
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