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MC: The abbreviation for marginal cost, which is 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 indicates how much total cost changes for a give change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (remember total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. Marginal cost is found by dividing the change in total cost (or total variable cost) by the change in output.

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PRODUCTION STAGES

The three stages of production are characterized by the slopes, shapes, and interrelationships of the total, marginal, and average product curves. The first stage is characterized by a positive slope of the average product curve, ending at the intersection between the average product and marginal product curves; the second stage by continues up to the point in which the marginal product becomes negative, at the peak of the total product curve; and the third stage exists over the range of in which the total product curve is negatively sloped. In Stage I, average product is positive and increasing. In Stage II, marginal product is positive, but decreasing. And in Stage III, total product is decreasing.

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Today, you are likely to spend a great deal of time browsing about a thrift store seeking to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for door-to-door salesmen.
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One of the largest markets for gold in the United States is the manufacturing of class rings.
"The man who can drive himself further once the effort gets painful is the man who will win. "

-- Roger Bannister, runner

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