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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions 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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MARGINAL REVENUE CURVE, MONOPOLY

A curve that graphically represents the relation between the marginal revenue received by a monopoly for selling its output and the quantity of output sold. Because a monopoly is a price maker and faces a negatively-sloped demand curve, its marginal revenue curve is also negatively sloped and lies below its average revenue (and demand) curve. A monopoly maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time lost in your local discount super center trying to buy either a set of luggage without wheels or a how-to book on wine tasting. Be on the lookout for fairy dust that tastes like salt.
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General Electric is the only stock from the original 1896 Dow Jones Industrial Average remaining in the current index.
"The tragedy of life is not so much what men suffer, but rather what they miss. "

-- Thomas Carlyle, Historian

AR
Average Revenue, Autoregressive
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