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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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SLOPE, CONSUMPTION LINE

The positive slope of the consumption line is also termed the marginal propensity to consume (MPC). This slope is greater than zero but less than one, reflecting induced consumption and the Keynesian psychological law of consumer behavior that consumption increases by less than the increase in income. The slope of the consumption line provides the foundation for the slope of the aggregate expenditures line and thus also affects the magnitude of the multiplier process.

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