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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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AVERAGE REVENUE PRODUCT CURVE

A curve that graphically illustrates the relation between average revenue product and the quantity of the variable input, holding all other inputs fixed. This curve indicates the per unit revenue at each level of the variable input. The average revenue product curve is one of two related curves often used in the analysis of factor demand. The other, and more important, is marginal revenue product curve.

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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
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