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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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PROPRIETORS' INCOME

The official factor payment item in the National Income and Product Accounts maintained by the Bureau of Economics Analysis measuring the combined payments for all four factors of production used in owner-operated business firms. Specifically, proprietors' income is the excess of revenue over explicit production cost of owner-operated businesses and includes payments for labor, capital, land, and entrepreneurship. This is one of five official factor payments making up national income. The other four are compensation of employees, rental income of persons, net interest, and corporate profits. Proprietors' income is usually less than 10 percent of national income, typically in the 7 to 10 percent range.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time at a crowded estate auction seeking to buy either a birthday greeting card for your father or a T-shirt commemorating the first day of spring. Be on the lookout for broken fingernail clippers.
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A communal society, a prime component of Karl Marx's communist philosophy, was advocated by the Greek philosophy Plato.
"In order to create there must be a dynamic force, and what force is more potent than love."

-- Igor Stravinsky, violinist

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Feasible Generalized Least Squares
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