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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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LONG-RUN INDUSTRY SUPPLY CURVE

The relation between market price and the quantity supplied by all firms in a perfectly competitive industry after the industry has completed its long-run adjustment. The long-run industry supply curve effectively traces out a series of equilibrium prices and quantities that reflect long-run adjustments of a perfectly competitive industry to demand shocks. This long-run adjustment can take one of three paths, indicating an increasing-cost industry, a decreasing-cost industry, and a constant-cost industry.

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Today, you are likely to spend a great deal of time at a dollar discount store wanting to buy either a coffee cup commemorating the 1960 Presidential election or a how-to book on fixing your computer, with illustrations. Be on the lookout for malfunctioning pocket calculators.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
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