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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 as completed its long-run adjustment. The long-run industry supply curve effectively traces out a series of equilibrium prices and quantities the reflect long-run adjustments of a perfectly competitive industry to demand shocks. This long-run adjustment can take one of three paths: increasing, decreasing, and constant. These three adjustment paths indicate an increasing-cost industry, decreasing-cost industry, and constant-cost industry, respectively.

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GAINS FROM TRADE

The combination of consumer surplus and producer surplus obtained by buyers and sellers when engaging in a market exchange. Gains from trade arise because buyers are typically willing and able to pay a higher price to purchase a good than what they end up paying and because sellers are typically willing and able to accept a lower price to sell a good than what they end up receiving. Both sides of the market exchange are thus better off, have a net gain in welfare, by making the trade. While all types of market exchanges generate gains from trade, this topic is perhaps most important for an understanding of international trade.

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Today, you are likely to spend a great deal of time lost in your local discount super center seeking to buy either several magazines on computer software or a T-shirt commemorating the second moon landing. Be on the lookout for door-to-door salesmen.
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John Maynard Keynes was born the same year Karl Marx died.
"If you wouldn't write it and sign it, don't say it."

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Comsumer Union of the United States
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