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BARTER: A method of trading goods, commodities, or services, directly for one another without the use of money. In a barter exchange one good is traded directly for another. This sort of exchange ultimately requires a double coincidence of wants, meaning that each trader has what the other trader wants and wants what the other has. Without a double coincidence of wants the exchange process can become exceedingly complex, requiring a great deal of resources to complete transactions, resources that can not be used for production. In fact, inefficient barter trading was the primary reason that money was invented. With money, more resources can be used for production and fewer are needed for trading.

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AVERAGE REVENUE CURVE, PERFECT COMPETITION

A curve that graphically represents the relation between average revenue received by a perfectly competitive firm for selling its output and the quantity of output sold. Because average revenue is essentially the price of a good, the average revenue curve is also the demand curve for a perfectly competitive firm's output.

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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either a weathervane with a chicken on top or a flower arrangement with daisies and carnations for your uncle. Be on the lookout for letters from the Internal Revenue Service.
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Two and a half gallons of oil are needed to produce one automobile tire.
"I much prefer the sharpest criticism of a single intelligent man to the thoughtless approval of the masses."

-- Johannes Kepler, German Astronomer

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Journal of Economic Perspectives
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