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EIGHT-FIRM CONCENTRATION RATIO: The proportion of total output in an industry that's produced by the eight largest firms in the industry. This is one of two common concentration ratios. The other is the four-firm concentration ratio. The eight-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and how market control is held by the eight largest firms in the industry.

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AGGREGATE SUPPLY DECREASE, SHORT-RUN AGGREGATE MARKET

A shock to the short-run aggregate market caused by a decrease in aggregate supply, resulting in and illustrated by a leftward shift of the short-run aggregate supply curve. A decrease in aggregate supply in the short-run aggregate market results in an increase in the price level and a decrease in real production. The level of real production resulting from the shock can be greater or less than full-employment real production.

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Today, you are likely to spend a great deal of time watching infomercials hoping to buy either a birthday gift for your father that doesn't look like every other birthday gift for your father or a green fountain pen. Be on the lookout for slightly overweight pizza delivery guys.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
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