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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions 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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HERFINDAHL INDEX

A measure of concentration of the production in an industry calculated as the sum of the squares of market shares for each firm. This is one method of summarizing the degree to which an industry is oligopolistic and the concentration of market control held by the largest firms in the industry. Two other measures of industry concentration are the four-firm concentration ratio and the eight-firm concentration ratio.

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APLS

RED AGGRESSERINE
[What's This?]

Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway seeking to buy either a black duffle bag with velcro closures or any book written by Isaac Asimov. Be on the lookout for crowded shopping malls.
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This isn't me! What am I?

Lewis Carroll, the author of Alice in Wonderland, was the pseudonym of Charles Dodgson, an accomplished mathematician and economist.
"I don't know the key to success, but the key to failure is trying to please everybody. "

-- Bill Cosby

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