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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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DOUBLE COINCIDENCE OF WANTS The requirements of a barter exchange that each trader has want the other wants and wants what the other has. Because everyone does not necessarily want everything, the lack of double coincidence of wants is a major obstacle in barter exchanges, especially for complex, modern economies like that fond in the United States. While double coincidence of wants is also essential for exchanges involving money, it is such an inherent trait of money that it is not a problem. By its very nature as a generally accepted medium of exchange, everyone WANTS money.
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RED AGGRESSERINE
[What's This?]
Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club seeking to buy either an AC adapter for your CD player or storage boxes for your family photos. Be on the lookout for slightly overweight pizza delivery guys.
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There were no banks in colonial America before the U.S. Revolutionary War. Anyone seeking a loan did so from another individual.
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"He who has a „why¾ to live can bear with almost any „how."" -- Friedrich Nietzsche, Philosopher
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JIE
Journal of Industrial Economics
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