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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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MACROECONOMIC SECTORS

The four aggregate sectors of the macroeconomy--household, business, government, and foreign--that reflect four key macroeconomic functions and are responsible for four expenditures on gross domestic product. These four sectors are the primary "actors" on the macroeconomic stage. Macroeconomic theories then explain macroeconomic phenomena by exploring the interaction among these four sectors.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers wanting to buy either a birthday greeting card for your grandfather or a weathervane with a cow on top. Be on the lookout for door-to-door salesmen.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"Advice is like snow ‚ the softer it falls, the longer it dwells upon and the deeper it sinks into the mind. "

-- Samuel Taylor Coleridge, poet

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