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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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SUPPLY SPACE

The area on or above a supply curve that indicates all possible price-quantity combinations acceptable to sellers. Buyers are willing and able to purchase any price-quantity combination that places them on or above the supply curve, but not above.

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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either a wall poster commemorating the 2000 Olympics or a flower arrangement with a lot of roses for your grandmother. Be on the lookout for infected paper cuts.
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Sixty percent of big-firm executives said the cover letter is as important or more important than the resume itself when you're looking for a new job
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