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March 12, 2026 

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EURO ZONE: The geographic area occupied by the member nations of the European Economic and Monetary Union that share the same currency (euro) and monetary policy.

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ORGANIZATION OF PETROLEUM EXPORTING COUNTRIES: 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. Commonly abbreviation OPEC, this organizations control over oil reserves gives it 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.

     See also | market control | monopoly | cartel | entry barriers | exhaustible resource | Hotelling's Rule | switching point | natural resources |


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CONCENTRATION RATIOS

A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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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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