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PRICE ELASTICITY OF DEMAND: The relative response of a change in quantity demanded to a relative change in price. More specifically the price elasticity of demand can be defined as the percentage change in quantity demanded due to a percentage change in demand price. The price elasticity of demand should be compared with the price elasticity of supply.

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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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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time at the confiscated property police auction seeking to buy either a weathervane with a cow on top or a box of multi-colored, plastic paper clips. Be on the lookout for mail order catalogs with hidden messages.
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