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PERFECT COMPETITION CHARACTERISTICS: The four key characteristics of perfect competition are: (1) large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology. These four characteristics mean that a given perfectly competitive firm is unable to exert any control whatsoever over the market.

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SCREENING

When confronted by asymmetric information, the use of small bits of information, or indicators, that suggest more comprehensive information. Screening occurs when those with limited information try to identify indicators suggesting more complete information. It is used in markets with adverse selection and moral hazard, especially in labor markets and in the provision of insurance. Common methods of screening include aptitude tests, affiliations, past behavior, and personal characteristics. A related method is signalling.

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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time at a garage sale wanting to buy either a birthday greeting card for your grandmother or a coffee cup commemorating yesterday. Be on the lookout for high interest rates.
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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!
"If we all did the things we are capable of doing, we would literally astound ourselves."

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