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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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APLS

ORANGE REBELOON
[What's This?]

Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either a weathervane with a cow on top or a box of multi-colored, plastic paper clips. Be on the lookout for attractive cable television service repair people.
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This isn't me! What am I?

The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
"Do what you feel in your heart to be right for you'll be criticized anyway. You'll be damned if you do and damned if you don't. "

-- Eleanor Roosevelt, first lady

QLR
Quasi-Likelihood Ratio
A PEDestrian's Guide
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