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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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SIXTH RULE OF IGNORANCE

The sixth of seven basic rules of the economy, stating that obtaining information is a costly activity that requires resources with alternative uses. As such, no one knows everything and everyone is ignorant about something.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club wanting to buy either blue cotton balls or a genuine down-filled pillow. Be on the lookout for a thesaurus filled with typos.
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Two and a half gallons of oil are needed to produce one automobile tire.
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