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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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NORMAL GOOD

A good for which a change in income causes a comparable change in demand. That is, an increase in income causes an increase in demand and a decrease in income causes a decrease in demand. The income elasticity of demand for a normal good is positive. A normal good is one of two alternatives falling within the buyers' income demand determinant. The other is an inferior good.

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