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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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EIGHT-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the eight largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The eight-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the eight largest firms in the industry.

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APLS

BROWN PRAGMATOX
[What's This?]

Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either a rechargeable battery for your computer or shoe laces for your snow boots. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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This isn't me! What am I?

A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
"When your values are clear to you, making decisions becomes easier. "

-- Roy Disney, executive

NE
Nash Equilibrium
A PEDestrian's Guide
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