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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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BALANCE OF TRADE SURPLUS

The positive difference of the value of goods and services exported out of a country less the value of goods and services imported into the country. A balance of trade surplus is the official term for positive net exports that occurs when exports exceed imports. A balance of trade surplus is also termed a "favorable" balance of trade because it results in a net inflow of monetary payments into the domestic economic from the foreign sector, which tends to be beneficial to a country. The alternative is a balance of trade deficit in which imports exceed exports.

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APLS

YELLOW CHIPPEROON
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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers looking to buy either an AC adapter for your CD player or storage boxes for your family photos. Be on the lookout for slow moving vehicles with darkened windows.
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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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QJE
Quarterly Journal of Economics
A PEDestrian's Guide
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