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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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PRODUCT

A generic term for a tangible good or an intangible service that is the output or end result of the resource transformation process of a business firm. This notion of product usually surfaces in the context of analyzing the short-run production of a firm, often modified by the terms total, marginal, and average, as in total product, marginal product, and average product.

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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
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