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VARIABLE: A quantity, usually represented as a symbol, that can take on one of a set of values. Variables play a key role in the scientific method and economic analysis. A major task undertaken by the study of economics is to identify the specific value of variables such as price, quantity, unemployment, production, wages, income, among a host of others. This often accomplished using assorted models, such as the market model.

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MARGINAL FACTOR COST

The change in total factor cost resulting from a change in the quantity of factor input employed by a firm. Marginal factor cost, abbreviated MFC, indicates how total factor cost changes with the employment of one more input. It is found by dividing the change in total factor cost by the change in the quantity of input used. Marginal factor cost is compared with marginal revenue product to identify the profit-maximizing quantity of input to hire.

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Today, you are likely to spend a great deal of time at a garage sale seeking to buy either a bookshelf that will fit in your closet or a birthday greeting card for your grandfather. Be on the lookout for telephone calls from long-lost relatives.
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Three-forths of the gold mined each year is used to manufacture jewelry.
"I not only use all the brains that I have, but all that I can borrow. "

-- Woodrow Wilson, 28th US president

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