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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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LAW

A generally accepted, verified, proven, fundamental scientific relation. A law is a scientifically certified, thoroughly verified, cause-and-effect relation about the workings of the world. It has been tested and retested through the scientific method. The law of demand, law of increasing opportunity cost, and law of diminishing marginal utility are three fundamental (and extremely important) economic laws of nature.

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APLS

BEIGE MUNDORTLE
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Today, you are likely to spend a great deal of time browsing about a thrift store seeking to buy either storage boxes for your winter clothes or several magazines on time travel. Be on the lookout for telephone calls from long-lost relatives.
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The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
"The will to win is important, but the will to prepare is vital. "

-- Joe Paterno, football coach

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Human Development Index
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