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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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EXCHANGE RATE POLICIES

Policies undertaken by domestic governments often in conjunction with international financial organizations to control exchange rates through foreign exchange markets. The three most common exchange rate policies are flexible exchange rates, fixed exchange rates, and managed flexible exchange rates. Flexible exchange rates are allowed to adjust through unrestrained forces of demand and supply in the foreign exchange market. Fixed exchange rates are established at a given level. Managed flexible exchange rates are allowed to change within boundaries, but subject to control if they change too much.

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