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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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THREE QUESTIONS OF ALLOCATION

The three basic questions that an economy must answer because of limited resources and unlimited wants and needs are: What? How? and For Whom? The basic problem of scarcity requires every society to determine: What goods to produce? How to produce the goods? And who receives the goods that are produced?

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APLS

YELLOW CHIPPEROON
[What's This?]

Today, you are likely to spend a great deal of time searching for a specialty store looking to buy either a genuine down-filled pillow or one of those "hang in there" kitty cat posters. Be on the lookout for poorly written technical manuals.
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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.
"You are never given a dream without also being given the power to make it true."

-- Richard Bach, Author

ARIMA
Autoregressive Integrated Moving Average
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