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HERFINDAHL 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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NET EXPORTS OF GOODS AND SERVICES

The official item in the National Income and Product Accounts maintained by the Bureau of Economics Analysis measuring net exports by the foreign sector. Net exports of goods and services is the smallest of the four expenditures, averaging around 2 percent of gross domestic product. Unlike the other expenditures, net exports of goods and services can be either positive or negative. They are positive when exports are greater than imports and negative when exports are less than imports. In recent years, net exports of goods and services have been negative. The other official expenditures included in the National Income and Product Accounts are personal consumption expenditures, gross private domestic investment, and government consumption expenditures and gross investment.

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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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NAIRU
Non-Accelerating Inflation Rate of Unemployment
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