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HHI: The common abbreviation for the Herfindahl-Hirshman index (or the Herfindahl index), which is 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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SILVER CERTIFICATES

Paper currency issued and authorized by the U.S. Department of the Treasury that is, in principle, backed up by, and exchangeable for, an equivalent value of silver. Silver certificates were in circulation as a medium of exchange for the U.S. economy during two periods, 1878 to 1923 and 1928 to 1957. A similar form of paper currency is gold certificates.

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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
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