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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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INFERIOR GOOD

A good for which a change in income causes an opposite change in demand. That is, an increase in income causes a decrease in demand and a decrease in income causes an increase in demand. The income elasticity of demand for an inferior good is negative. An inferior good is one of two alternatives falling within the buyers' income demand determinant. The other is a normal good.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs trying to buy either decorative celebrity figurines or a flower arrangement with anything but tulips for your grandfather. Be on the lookout for broken fingernail clippers.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
"Give the American people a good cause, and there's nothing they can't lick. "

-- John Wayne, actor

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