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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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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club seeking to buy either a birthday greeting card for your mother that doesn't look like a greeting card or a handcrafted spice rack. Be on the lookout for poorly written technical manuals.
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In 1914, Ford paid workers who were age 22 or older $5 per day -- double the average wage offered by other car factories.
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