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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 EXPENDITURES DETERMINANTS

Ceteris paribus factors, other than aggregate income or production, that are held constant when the aggregate expenditures line is constructed and which cause the aggregate expenditures line to shift when they change. Some of the more important aggregate expenditures determinants are interest rates, expectations, fiscal policy, wealth, and exchange rates.

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Today, you are likely to spend a great deal of time at a crowded estate auction looking to buy either a country wreathe or galvanized steel storage shelves. Be on the lookout for fairy dust that tastes like salt.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"The truth is not for all men, but only for those who seek it. "

-- Ayn Rand, writer

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