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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.

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ECONOMIC PROFIT

The difference between the total opportunity cost of production and the total revenue received by a firm. Economic profit is what remains after ALL opportunity cost associated with production (including a normal profit) is deducted from the revenue generated by the production. Economic profit is one of three alternative notions of profit. The other two are accounting profit and normal profit.

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Today, you are likely to spend a great deal of time strolling through a department store looking to buy either a coffee cup commemorating the first day of winter or a video game player. Be on the lookout for neighborhood pets, especially belligerent parrots.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"The past is a foreign country; they do things differently there."

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