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BARRIER TO ENTRY: 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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AVERAGE REVENUE CURVE, MONOPOLY

A curve that graphically represents the relation between average revenue received by a monopoly for selling its output and the quantity of output sold. Because average revenue is essentially the price of a good, the average revenue curve is also the demand curve for a monopoly's output.

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Today, you are likely to spend a great deal of time surfing the Internet trying to buy either a printer that works with your stockpile of ink cartridges or income tax software. Be on the lookout for broken fingernail clippers.
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Junk bonds are so called because they have a better than 50% chance of default, carrying a Standard & Poor's rating of CC or lower.
"The time your game is most vulnerable is when you're ahead; never let up. "

-- Rod Laver, Tennis player

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Journal of Political Economy
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