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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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PERFECT COMPETITION, PROFIT MAXIMIZATION A perfectly competitive firm is presumed to produce the quantity of output that maximizes economic profit--the difference between total revenue and total cost. This production decision can be analyzed directly with economic profit, by identifying the greatest difference between total revenue and total cost, or by the equality between marginal revenue and marginal cost.
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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers hoping to buy either a small palm tree that will fit on your coffee table or several magazines on fashion design. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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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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"Enthusiasm is the greatest asset in the world. It beats money and power and influence. It is no more or less than faith in action. " -- Henry Chester, Writer
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