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AR: The abbreviation for average revenue, which is the revenue received for selling a good, per unit of output sold, found by dividing total revenue by the quantity of output. Average revenue actually goes by a simpler and more widely used term... price. Average revenue is really a fancy-schmancy term for the price received by a seller for selling a good. However, using the longer term average revenue let's us see the connection with other terms, like total revenue, marginal revenue, and quantity.

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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 surfing the Internet hoping to buy either a pair of gray heavy duty boot socks or a 50-foot blue garden hose. Be on the lookout for telephone calls from long-lost relatives.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
"In the long run men hit only what they aim at. "

-- Henry David Thoreau, philosopher

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