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BARTER EXCHANGE: 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. See market.

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MARGINAL REVENUE CURVE, MONOPOLY

A curve that graphically represents the relation between the marginal revenue received by a monopoly for selling its output and the quantity of output sold. Because a monopoly is a price maker and faces a negatively-sloped demand curve, its marginal revenue curve is also negatively sloped and lies below its average revenue (and demand) curve. A monopoly maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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Today, you are likely to spend a great deal of time at a flea market wanting to buy either a remote controlled World War I bi-plane or a wall poster commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for jovial bank tellers.
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Natural gas has no odor. The smell is added artificially so that leaks can be detected.
"Lord, where we are wrong, make us willing to change; where we are right, make us easy to live with. "

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