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LERNER INDEX: The difference between price (p) and marginal cost (mc) as a fraction of price, that is [p-mc]/p. The Lerner index is usually taken as an indicator of market power because the larger the index, the larger the difference between price and marginal cost, that is, the larger the distance between the price and the competitive price. The Lerner index depends on the elasticity of demand. The Lerner index is also called the price-cost margin.

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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 going from convenience store to convenience store trying to buy either a genuine down-filled snow parka or throw pillows for your living room sofa. Be on the lookout for infected paper cuts.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
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Capital Asset Pricing Model
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