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MARGINAL COST CURVE: A curve that graphically represents the relation between marginal cost incurred by a firm in the short-run product of a good or service and the quantity of output produced. This curve is constructed to capture the relation between marginal cost and the level of output, holding other variables, like technology and resource prices, constant. The marginal cost curve is U-shaped. Marginal cost is relatively high at small quantities of output, then as production increases, declines, reaches a minimum value, then rises. This shape of the marginal cost curve is directly attributable to increasing, then decreasing marginal returns (and the law of diminishing marginal returns).

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POSITIVE ECONOMICS

The branch of economics that seeks to explain the way the economy actually operates. It is the application of the scientific method and the process of testing hypothesis to economic phenomena. A positive economic statement is one that can be refuted by looking at the real world--that is, by testing a hypothesis.

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Today, you are likely to spend a great deal of time at a flea market trying to buy either a pair of red goulashes with shiny buckles or a handcrafted bird feeder. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
"You can't build a reputation on what you are going to do."

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AFC
Average Fixed Cost
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