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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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AGGREGATE DEMAND SHIFTS Changes in the aggregate demand determinants cause the aggregate demand curve to shift. The mechanism is comparable to that for market demand determinants and market demand. There are two alternatives--an increase in aggregate demand and a decrease in aggregate demand. An increase in spending by any of the four sectors--household, business, government, and foreign--shifts the aggregate demand curve to right. A decrease in spending by these four sectors shifts the aggregate demand curve to left.
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WHITE GULLIBON
[What's This?]
Today, you are likely to spend a great deal of time touring the new suburban shopping complex looking to buy either a birthday greeting card for your grandmother or a coffee cup commemorating yesterday. Be on the lookout for door-to-door salesmen.
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This isn't me! What am I?
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Two and a half gallons of oil are needed to produce one automobile tire.
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"Managing intellectual assets has become the single most important task of business. " -- Thomas Stewart, author
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JPE
Journal of Political Economy
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