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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 EXPENDITURES DETERMINANTS

Ceteris paribus factors, other than aggregate income or production, that are held constant when the aggregate expenditures line is constructed and which cause the aggregate expenditures line to shift when they change. Some of the more important aggregate expenditures determinants are interest rates, expectations, fiscal policy, wealth, and exchange rates.

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Today, you are likely to spend a great deal of time browsing about a thrift store looking to buy either a small palm tree that will fit on your coffee table or several magazines on fashion design. Be on the lookout for crowded shopping malls.
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Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
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