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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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THEORY

An empirically verified, interrelated body of general principles, axioms, and assumptions that is used to explain and understand real world phenomena. Theories are the cornerstone of the scientific method. They generate the hypotheses that are verified against real world data. The construction and refinement of theories, accomplished through the hypothesis verification process, is the primary goal of doing science.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers trying to buy either a blue mechanical pencil or super soft, super cuddly, stuffed animals. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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The first U.S. fire insurance company was established by Benjamin Franklin in 1752 in Philadelphia.
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