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PAPER CURRENCY: Paper usually issued by the national government that are used as money. Metal coins are also frequently included under the generic heading of currency. Currency in the U.S. economy is issued by the Federal Reserve System (paper) and the U.S. Treasury (coins). This constitutes about 30 to 40 percent of the M1 money supply. Most modern currency is fiat money.

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CONCENTRATION RATIOS

A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites wanting to buy either a cross-cut paper shredder or a birthday greeting card for your father. Be on the lookout for malfunctioning pocket calculators.
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