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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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ACCOUNTING COST

An actual outlay or expenses incurred in the production of a good that shows up in a firm's accounting statements and records. Accounting cost is an explicit payment (that is, money changing hands) incurred by a firm. Accounting cost, while very important to accountants, company CEOs, shareholders, and the Internal Revenue Service, is only minimally important to economists. The reason is that economists are more interested in economic cost (also called opportunity cost), which is the value of foregone production.

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Today, you are likely to spend a great deal of time searching for a specialty store hoping to buy either a Boston Red Sox baseball cap or a square lamp shade with frills along the bottom. Be on the lookout for broken fingernail clippers.
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The New York Stock Exchange was established by a group of investors in New York City in 1817 under a buttonwood tree at the end of a little road named Wall Street.
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