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MARGINAL FACTOR COST, PERFECT COMPETITION: The change in total factor cost resulting from a change in the quantity of factor input employed by a perfectly competitive 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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AGGREGATE SUPPLY SHIFTS

Changes in the aggregate supply determinants shift both the short-run aggregate supply curve and the long-run aggregate supply curve. The mechanism is comparable to that for market supply determinants and market supply. There are two options--an increase in aggregate supply and a decrease in aggregate supply. An increase in resource quantity or quality or a decrease in resource price shifts one or both of the aggregate supply curves to right. A decrease in resource quantity or quality or an increase in resource price shifts one or both of the aggregate supply curves to left.

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Today, you are likely to spend a great deal of time wandering around the shopping mall hoping to buy either a large stuffed brown and white teddy bear or a replacement washer for your kitchen faucet. Be on the lookout for jovial bank tellers.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
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