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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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CHANGE IN AGGREGATE DEMAND

A shift of the aggregate demand curve caused by a change in one of the aggregate demand determinants. A change in aggregate demand is caused by any factor affecting aggregate demand EXCEPT the price level. This is one of two changes related to aggregate demand. The other is a change in aggregate expenditures. A change in aggregate demand is comparable to a change in market demand.

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Today, you are likely to spend a great deal of time browsing about a thrift store wanting to buy either a three-hole paper punch or decorative picture frames. Be on the lookout for rusty deck screws.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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