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CHANGE IN QUANTITY SUPPLIED: The movement along a supply curve caused by a change in the price of the good. This should be contrasted directly with a change in supply. You might also want to review the terms change in quantity demanded and change in demand, as well. A change in quantity supplied means that we have identified a NEW quantity on the existing supply curve. In contrast, a change in supply means that we have changed, moved, or shifted, the entire supply curve, the whole range of prices and quantities has changed.

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MARGINAL PRODUCTIVITY THEORY

A theory used to analyze the profit-maximizing quantity of inputs (that is, the services of factor of productions) purchased by a firm in the production of output. Marginal-productivity theory indicates that the demand for a factor of production is based on the marginal product of the factor. In particular, a firm is generally willing to pay a higher price for an input that is more productive and contributes more to output. The demand for an input is thus best termed a derived demand.

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