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BARRIER TO ENTRY: 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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INFERIOR GOOD

A good for which a change in income causes an opposite change in demand. That is, an increase in income causes a decrease in demand and a decrease in income causes an increase in demand. The income elasticity of demand for an inferior good is negative. An inferior good is one of two alternatives falling within the buyers' income demand determinant. The other is a normal good.

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Today, you are likely to spend a great deal of time at a going out of business sale seeking to buy either a desktop calendar with all federal and state holidays highlighted or a half-dozen helium filled balloons. Be on the lookout for jovial bank tellers.
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Parker Brothers, the folks who produce the Monopoly board game, prints more Monopoly money each year than real currency printed by the U.S. government.
"No man, for any considerable time, can wear one face to himself and another to the multitude without finally getting bewildered as to which may be true."

-- Nathanial Hawthorne, Author

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