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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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CARTEL

A formal agreement between businesses in the same industry, usually on an international scale, to gain market control, raise the market price, and otherwise act like a monopoly. The most famous international cartel is the Organization of Petroleum Exporting Countries (OPEC), which seeks to exert control over the world oil market. Other cartels have existed, or still exist, in the global markets for uranium, diamonds, long distance telephone services, and airlines.

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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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