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INFERIOR GOOD: A good for which an increase in income causes a decrease in demand, or a leftward shift in the demand curve. If demand decreases as income increases, it is an inferior good, or a good with a negative income elasticity of demand. An inferior good is one of two alternatives falling within the income determinant of demand. The other is a normal good.

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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 visiting every yard sale in a 30-mile radius hoping to buy either a rechargeable battery for your camera or a coffee cup commemorating the first day of spring. Be on the lookout for spoiled cheese hiding under your bed hatching conspiracies against humanity.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
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