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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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RISK POOLING

The process of combining the risks facing individuals into larger groups. This process can be used effectively to transfer individual risks to the entire group. This makes it possible to calculated the risk for the group. Risk pooling is the standard technique that enables the provision of insurance services.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites looking to buy either a T-shirt commemorating next Thursday or a birthday gift for your uncle. Be on the lookout for door-to-door salesmen.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"The difference between the impossible and the possible lies in a person's determination. "

-- Tommy Lasorda

IROR
Internal Rate of Return
A PEDestrian's Guide
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