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MARKET STRUCTURE: The manner in which a market is organized, based largely on the number of firms in the industry. The four basic market structure models are: perfect competition, monopoly, monopolistic competition, and oligopoly. The primary difference between each is the number of firms on the supply side of a market. Both perfect competition and monopolistic competition have a large number of relatively small firms selling output. Oligopoly has a small number of relatively large firms. And monopoly has a single firm.

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SIGNALLING

When confronted by asymmetric information, the use of small bits of information, or indicators, that suggest more comprehensive information. Signalling is used by those with more information to reduce the cost of informing those with less information. It is commonly used in markets with adverse selection. Methods of signalling include advertising, brand names, and warranties. A related method is screening.

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Today, you are likely to spend a great deal of time strolling through a department store hoping to buy either a coffee table shaped like the state of Florida or storage boxes for your summer clothes. Be on the lookout for telephone calls from former employers.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"It has been my philosophy of life that difficulties vanish when faced boldly. "

-- Isaac Asimov

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