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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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MONOPOLISTIC COMPETITION, CHARACTERISTICS

The four key characteristics of monopolistic competition are: (1) large number of small firms, (2) similar but not identical products sold by the firms, (3) relative freedom of entry into and exit out of the industry, and (4) extensive knowledge of prices and technology.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store hoping to buy either rechargeable batteries or a rechargeable battery for your computer. Be on the lookout for strangers with large satchels of used undergarments.
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General Electric is the only stock from the original 1896 Dow Jones Industrial Average remaining in the current index.
"In the business world, everyone is paid in two coins: cash and experience. Take the experience first; the cash will come later. "

-- Harold S. Green, MCI founder

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