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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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ECONOMIC COST

An alternative term for opportunity cost, which is the highest valued alternative foregone in the pursuit of an activity. Opportunity cost, or economic cost, is one of the most fundamental concepts used in the study of economics, hence the reason it is also termed economic cost. Economic, or opportunity cost is also commonly termed just cost.

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Today, you are likely to spend a great deal of time looking for a downtown retail store hoping to buy either a tall storage cabinet with five shelves and a secure lock or a birthday greeting card for your grandmother. Be on the lookout for poorly written technical manuals.
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A half gallon milk jug holds about $50 in pennies.
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