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EFFICIENT: The state of resource allocation the exists when the highest level of consumer satisfaction is achieved from the available resources. Competitive markets, absent of any market failure and especially market control by either side, is efficient. In particular, this feat is accomplished when the price buyers are willing and able to pay for a good--based on the satisfaction obtained--is equal to the price sellers need to charge for a good--based on the opportunity cost of production. In other words, the value (satisfaction) of stuff given up to get a good is the same as the value (satisfaction) of the good produced. Satisfaction won't increase by producing more of either.

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MARGINAL COST

The change in total cost (or total variable cost) resulting from a change in the quantity of output produced by a firm in the short run. Marginal cost (MC) indicates how much total cost changes for a given change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. It is found by dividing the change in total cost (or total variable cost) by the change in output. Marginal cost is one of four cost concepts used in short-run production analysis. The other three are average total cost, average fixed cost, and average variable cost.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs seeking to buy either a green and yellow striped sweater vest or a Boston Red Sox baseball cap. Be on the lookout for celebrities who speak directly to you through your television.
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During the American Revolution, the price of corn rose 10,000 percent, the price of wheat 14,000 percent, the price of flour 15,000 percent, and the price of beef 33,000 percent.
"Love looks through a telescope; envy, through a microscope. "

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