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OLIGOPOLY, REALISM: Real world markets are heavily populated by oligopoly. About half of all output produced in the U.S. economy each year is done so by oligopoly firms. Other industrialized nations can make a similar claim. Oligopoly markets arise in a wide assortment different industries, ranging from manufacturing to retail trade to resource extraction to financial services.

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MARKET SHARE: The fraction of an industry's total sales accounted for by a single business. In general, market share is a "first-guess" indicator of a firm's market control. If, for example, a company has a market share of 100 percent (that is, a monopoly), then you can rest assured it has a substantial amount of market control. A company with a 25 percent market share has less, but still notable, market control. In fact, when you get right down to the bottom line, the phrase "market share" is only worth mentioning for oligopolistic firms with a significant degree of market control. There really is no market control for a monopolistically competitive firm with a 0.00000001 percent market share.

     See also | market | market control | imperfect competition | oligopoly | monopolistic competition | concentration ratio |


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MARKET SHARE, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2018. [Accessed: June 25, 2018].


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AVERAGE FIXED COST CURVE

A curve that graphically represents the relation between average fixed cost incurred by a firm in the short-run product of a good or service and the quantity produced. This curve is constructed to capture the relation between average fixed cost and the level of output, holding other variables, like technology and resource prices, constant. The average fixed cost curve is one of three average curves. The other two are average total cost curve and average variable cost curve. A related curve is the marginal cost curve.

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Today, you are likely to spend a great deal of time at a going out of business sale looking to buy either a T-shirt commemorating the first day of spring or a coffee cup commemorating last Friday (you know why). Be on the lookout for door-to-door salesmen.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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