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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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MERGER

The consolidation of two or more separately-owned businesses under single ownership. Mergers fall into one of three classes--(1) horizontal between firms that sell competing products in the same market, (2) vertical between firms in different stages of the production of one good, and (3) conglomerate between firms that are in separate industries. Because horizontal mergers tend to reduce competition, they are most likely to be scrutinized by government. Mergers are one of several behavioral inclinations of oligopoly. A related oligopolistic behavior is collusion.

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