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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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OLIGOPSONY

A market characterized by a small number of large buyers controlling the buying-side of a market. Oligopsony is the buying-side equivalent of a selling-side oligopoly. Much as a oligopoly is a market dominated by a few large sellers, oligopsony is a market dominated by a few large buyers. While oligopsony could be analyzed for any type of market it tends to be most relevant for factor markets in which a handful of firms control the buying of a factor. Two related buying side market structures are monopsony and monopsonistic competition.

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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time searching for a specialty store looking to buy either a birthday gift for your grandmother or a T-shirt commemorating yesterday. Be on the lookout for the last item on a shelf.
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This isn't me! What am I?

Al Capone's business card said he was a used furniture dealer.
"Do something wonderful; people may imitate it. "

-- Albert Schweitzer, theologian, physician

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