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HERFINDAHL-HIRSHMAN INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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MANAGED FLEXIBLE EXCHANGE RATE

An exchange rate control policy in which an exchange rate that is generally allowed to adjust to equilibrium levels through to the interaction of supply and demand in the foreign exchange market, but with occasional intervention by government. Also termed managed float or dirty float, most nations of the world currently use a managed flexible exchange rate policy. With this alternative an exchange rate is free to rise and fall, but it is subject to government control if it moves too high or too low. With managed float, the government steps into the foreign exchange market and buys or sells whatever currency is necessary keep the exchange rate within desired limits. This is one of three basic exchange rate policies used by domestic governments. The other two policies are flexible exchange rate and fixed exchange rate.

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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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