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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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VOLUNTARY EXCHANGE

The process of willingly trading one valuable commodity (good, service, or resource) for another. The key term is "willingly," which distinguishes voluntary exchanges from involuntary exchanges, such as those created by government taxes. Voluntary exchanges are the foundation of market transactions.

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Today, you are likely to spend a great deal of time at an auction wanting to buy either any book written by Stephan King or a T-shirt commemorating next Thursday. Be on the lookout for door-to-door salesmen.
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There were no banks in colonial America before the U.S. Revolutionary War. Anyone seeking a loan did so from another individual.
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