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MARGINAL FACTOR COST: The change in total factor cost resulting from a change in the quantity of factor input, found by dividing the change in total factor cost by the change in quantity of factor input. Marginal factor cost, abbreviated MFC, indicates how a firm's total factor cost is affected by hiring one more or one fewer worker. Two related concepts are total factor cost and average factor cost.

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RULE OF CONSUMER EQUILIBRIUM

A condition of consumer equilibrium and utility maximization stating that the marginal utility-price ratios for all goods are equal. This rule is a handy way of checking for consumer equilibrium and utility maximization. If the rule is not satisfied, then consumer equilibrium and utility maximization are not achieved.

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Today, you are likely to spend a great deal of time flipping through the yellow pages seeking to buy either a T-shirt commemorating the first day of spring or a coffee cup commemorating last Friday (you know why). Be on the lookout for telephone calls from long-lost relatives.
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