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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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CAPTURE THEORY OF REGULATION The notion that a government agency established to regulate an industry for the benefit of society acts instead for the benefit of the industry. In effect, the government agency is "captured" by the industry it is regulating. The capture theory of regulation indicates that government regulator acts as the decision-making "head" of a now monopolized industry. This is achieved by a "rotating door" between the government agency and the industry, with members of the regulating agency being former and future employees of the industry. Rather than promoting efficiency, the regulating agency creates an inefficient allocation of resources.
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The New York Stock Exchange was established by a group of investors in New York City in 1817 under a buttonwood tree at the end of a little road named Wall Street.
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"In the long run men hit only what they aim at. " -- Henry David Thoreau, philosopher
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AEA
American Economic Association
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