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July 18, 2025 

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X-AXIS: In a graph, this is one of two lines that intersect at a right angle at their origins. This is the "horizontal-axis" that runs from right and left. In most analyses, the variable measured on the X-axis is consider to be the independent 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 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, usually abbreviated MC, is found by dividing the change in total cost (or total variable cost) by the change in output.

     See also | total cost | total variable cost | marginal cost curve | quantity | law of diminishing marginal returns | technology | resource prices | increasing marginal returns | decreasing marginal returns | U-shaped cost curves | average total cost | average variable cost | average fixed cost | total cost |


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MARGINAL COST, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 18, 2025].


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SIGNALLING

When confronted by asymmetric information, the use of small bits of information, or indicators, that suggest more comprehensive information. Signalling is used by those with more information to reduce the cost of informing those with less information. It is commonly used in markets with adverse selection. Methods of signalling include advertising, brand names, and warranties. A related method is screening.

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