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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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M3

The wide-range monetary aggregate for the U.S. economy containing the combination of M2 (currency, checkable deposits, and assorted savings deposits) and large-denomination, institutional near monies. M3 contains financial assets that are relatively liquid, but not quite as liquid as those found in M1 or M2. The near monies added to M2 to derive M3 include large denomination certificates of deposit, institutional money market mutual funds, repurchase agreements, and Eurodollars. M3 is one of three monetary aggregates tracked and reported by the Federal Reserve System. The other two are designated M1 and M2.

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