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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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MACROECONOMIC THEORIES

Scientific theories that seek to explain phenomena associated with the macroeconomy. The primary phenomena investigated are unemployment, inflation, and the level of aggregate production. Macroeconomic theories also inevitably provide policy recommendations intended to improve the performance of the economy and to correct macroeconomic problems. A few of the more noted macroeconomic theories are: Classical economics, Keynesian economics, aggregate market (AS-AD) analysis, IS-LM analysis, Monetarism, and New Classical economics.

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Today, you are likely to spend a great deal of time looking for a downtown retail store trying to buy either several magazines on home repairs or a remote controlled sports car with an air spoiler. Be on the lookout for small children selling products door-to-door.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"If we all did the things we are capable of doing, we would literally astound ourselves."

-- Thomas Edison

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