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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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MARGINAL BENEFIT OF SEARCH

The incremental benefit generated by additional search effort is the marginal benefit of search. Marginal benefit of search, also termed marginal search benefit, is comparable to marginal revenue of short-run production analysis and marginal utility of consumer demand theory. Marginal benefit of search decreases with an increase in search effort and is represented by the marginal benefit of search curve. This is one half of the efficient information search decision. The other is marginal cost of search.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius wanting to buy either a wall poster commemorating the moon landing or storage boxes for your winter clothes. Be on the lookout for malfunctioning pocket calculators.
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