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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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ACCOUNTING PROFIT

The difference between the revenue received by a firm and the explicit accounting cost incurred. This is the profit listed on a firm's balance sheet, appears periodically in the financial sector of the newspaper, and is reported to the Internal Revenue Service for tax purposes. While accounting profit is the "standard" designation of profit used in the business world, economists prefer to use economic profit

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex seeking to buy either a revolving spice rack or a how-to book on home repairs. Be on the lookout for strangers with large satchels of used undergarments.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"When I look back on all these worries, I remember the story of the old man who said on his deathbed that he had had a lot of trouble in his life, most of which had never happened. "

-- Winston Churchill, British statesman

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