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ENTRY BARRIER: An institutional, government, technological, or economic restriction on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.
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MINIMUM EFFICIENT SCALE The quantity of production that places a firm at the lowest point on its long-run average cost curve. The minimum efficient scale achieves production of a good at the lowest possible opportunity cost. In other words, it is not possible to produced a good at any lower cost than at the minimum efficient scale. At this quantity the production involves foregoing the least amount of other goods.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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"Most of the things worth doing in the world had been declared impossible before they were done." -- Louis D. Brandeis, Supreme Court Justice
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MA(N)
A nth-order Moving Average Process
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