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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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CONCENTRATION RATIOS

A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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Today, you are likely to spend a great deal of time browsing about a thrift store trying to buy either a rechargeable battery for your computer or shoe laces for your snow boots. Be on the lookout for slow moving vehicles with darkened windows.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
"As the births of living creatures at first are ill-shapen, so are all innovations, which are the births of time. "

-- Sir Francis Bacon, philosopher

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