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PEAK: The transition of a business cycle from an expansion and a contraction. The end of an expansions carries the descriptive term peak. At the peak, the economy has reached the highest level of production in recent times. The bad thing about a peak, however, is that it is a turning point, a turning point to a contraction. So even though a peak is the "highest" is not necessarily something we want. We would prefer never to reach the peak.

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FOUR-FIRM CONCENTRATION RATIO: The proportion of total output in an industry that's produced by the four largest firms in the industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and how market control is held by the four largest firms in the industry.

     See also | concentration ratio | eight-firm concentration ratio | market share | market control | oligopoly | monopolistic competition |


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AMERICAN ECONOMIC ASSOCIATION

A formal organization of professional economists that promotes economic research, organizes annual meetings and conferences, and maintains a list of publications in several economics subjects. The American Economic Association (AEA) was originally organized by a small group interested in economics at a meeting in 1888 in Saratoga, New York. However, as interest in the subject grew, it officially incorporated in 1923. Although the AEA contained only a small number of members in the beginning, today the membership is approximately 18,000. In addition, about 4,600 libraries, institutions, and firms subscribe to the quarterly publications of the AEA.

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General Electric is the only stock from the original 1896 Dow Jones Industrial Average remaining in the current index.
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