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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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FACTORY

The physical capital (building and equipment) at a particular location used for the production of goods and services. A factory, or plant, is usually a relatively large production operation (compared with something smaller, like a shop). While factory and firm are occasionally used synonymously they are not really the same. A given firm might own more than factory and a given factory might be owned by more than one firm.

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