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AGGREGATE SUPPLY SHIFTS: Changes in the aggregate supply determinants can shift either 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. We have 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 prices shift the aggregate supply curves to right. A decrease in resource quantity or quality or an increase in resource prices shift the aggregate supply curves to left.

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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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