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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions 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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INTERCEPT, GOVERNMENT PURCHASES LINE

The intercept of the government purchases line indicates autonomous government purchases, government purchases that do not depend on the level of income or production. This can be thought of as government purchases that the government sector undertakes regardless of the state of the economy. Autonomous government purchases are affected by the government purchases determinants, which cause a change in the intercept and a shift of the government purchases line.

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Today, you are likely to spend a great deal of time at a flea market trying to buy either software that won't crash your computer or any book written by Stephan King. Be on the lookout for telephone calls from long-lost relatives.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
"Failure is the opportunity to begin again, more intelligently. "

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AR(N)
A nth-order Autoregressive Process
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