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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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CETERIS PARIBUS

A Latin term meaning that other factors remain unchanged. Ceteris paribus is commonly used as an assumption when conducting a wide variety of economic analyses. By holding everything else constant, the ceteris paribus assumption makes it possible to identify the cause-and-effect relation between two factors. Relaxing the ceteris paribus assumption is the primary analytical technique used in the comparative statics study of economics.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either a New York Yankees baseball cap or several magazines on home repairs. Be on the lookout for small children selling products door-to-door.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
"Whenever you see a successful business, someone once made a courageous decision."

-- Peter F. Drucker, business strategist

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Institute for Research on Public Policy
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