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QUANTITY: In a market, the amount of a good that is bought, sold, or traded among buyers and sellers. In a standard market diagram, quantity is displayed on the horizontal axis.

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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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Today, you are likely to spend a great deal of time at an auction wanting to buy either any book written by Isaac Asimov or a how-to book on building remote controlled airplanes. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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Two and a half gallons of oil are needed to produce one automobile tire.
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