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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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TERMS OF TRADE

The rate at which goods are traded, either between individuals or between nations. It is the quantity of one good exchanged per unit of another good. The terms of trade is essentially the price. But the price is stated in terms of the quantity of another good. Like any market price, the terms of trade is based on what the buyers are willing to pay and what the sellers are willing to accept. The terms of trade between any two countries is based on the relative opportunity cost in each country.

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