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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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SIXTH RULE OF IGNORANCE The sixth of seven basic rules of the economy, stating that obtaining information is a costly activity that requires resources with alternative uses. As such, no one knows everything and everyone is ignorant about something.
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GREEN LOGIGUIN
[What's This?]
Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either a T-shirt commemorating the 2000 Olympics or a genuine fake plastic Tiffany lamp. Be on the lookout for high interest rates.
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In the early 1900s around 300 automobile companies operated in the United States.
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"It has been my philosophy of life that difficulties vanish when faced boldly. " -- Isaac Asimov
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AR(N)
A nth-order Autoregressive Process
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