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ACCOUNTING COST: The actual outlays or expenses incurred in production that shows up a firm's accounting statements or records. Accounting costs, 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 primarily interested in economic cost (also called opportunity cost). That fact is that accounting costs and economic costs aren't always the same. An opportunity or economic cost is the value of foregone production. Some economic costs, actually a lot of economic opportunity costs, never show up as accounting costs. Moreover, some accounting costs, while legal, bonified payments by a firm, are not associated with any sort of opportunity cost.

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CONCENTRATION RATIOS

A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either a set of tires or a birthday gift for your grandfather. Be on the lookout for telephone calls from long-lost relatives.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
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