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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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MARGINAL UTILITY CURVE

A curve illustrating the relation between the marginal utility obtained from consuming an additional unit of good and the quantity of the good consumed. The negative slope of the marginal utility curve reflects the law of diminishing marginal utility. The marginal utility curve also can be used to derived the demand curve.

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Today, you are likely to spend a great deal of time at a garage sale hoping to buy either a set of hubcaps or handcrafted decorations to hang on your walls. Be on the lookout for crowded shopping malls.
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