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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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CHANGE IN AGGREGATE EXPENDITURES The movement along an aggregate demand curve caused by a change in the price level. A change in aggregate expenditures is ONLY caused by a change in the price level. This is one of two changes related to aggregate demand. The other is a change in aggregate demand. A change in aggregate expenditures is comparable to a change in quantity demanded.
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GREEN LOGIGUIN [What's This?]
Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either a birthday gift for your grandmother or a T-shirt commemorating yesterday. Be on the lookout for defective microphones. Your Complete Scope
This isn't me! What am I?
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Lombard Street is London's equivalent of New York's Wall Street.
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"Follow effective action with quiet reflection. From the quiet reflection will come even more effective action. " -- Peter F. Drucker, author
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CRSP Center for Research in Security Prices
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