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ZERO SLOPE: A horizontal line in which the numerical value of the slope, calculated as the change in the variable on the vertical axis divided by a change in the variable on the horizontal axis, is zero. In other words, the Y-axis variable is fixed, or constant, for any and all values of the X-axis variable.

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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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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers seeking to buy either a green and yellow striped sweater vest or a Boston Red Sox baseball cap. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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John Maynard Keynes was born the same year Karl Marx died.
"Defeat is simply a signal to press onward."

-- Helen Keller, lecturer, author

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