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OLIGOPSONY: A market structure dominated by a small number of large buyers controlling the buying-side of a market. Oligopsony is the somewhat obscure and seldom discussed buying counterpart to an oligopoly seller that controls the selling side of a market. Whereas oligopoly is most relevant to product markets, oligopsony is most relevant to factor markets.

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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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Today, you are likely to spend a great deal of time watching infomercials seeking to buy either a T-shirt commemorating yesterday or a pair of handcrafted oven mitts. Be on the lookout for jovial bank tellers.
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