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COMPETITION: In general, the actions of two or more rivals in pursuit of the same objective. In the context of markets, the specific objective is either selling goods to buyers or alternatively buying goods from sellers. Competition tends to come in two varieties -- competition among the few, which is market with a small number of sellers (or buyers), such that each seller (or buyer) has some degree of market control, and competition among the many, which is a market with so many buyers and sellers that none is able to influence the market price or quantity exchanged.

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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 searching the newspaper want ads trying to buy either a birthday greeting card for your father or a T-shirt commemorating the first day of spring. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
"Do what you feel in your heart to be right ‚ for you'll be criticized anyway. You'll be damned if you do and damned if you don't. "

-- Eleanor Roosevelt, first lady

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