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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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FOUR-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the four largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the four largest firms in the industry.

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Today, you are likely to spend a great deal of time watching infomercials seeking to buy either a video camera with stop action features or one of those memory foam pillows. Be on the lookout for jovial bank tellers.
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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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