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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 its output. Marginal productivity theory indicates that the demand for a factor of production input is based on the marginal product of the factor and the price of the output produced by the factor.

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SUBSTITUTION EFFECT

The change in quantity demanded that results because a change in the demand price of a good causes a change in the relative prices, which induces buyers to substitute the purchase of one good for another. This is one of two reasons, or effects, underlying the law of demand and the negative slope of the market demand curve. The other is the income effect.

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Today, you are likely to spend a great deal of time looking for a downtown retail store wanting to buy either a green fountain pen or a handcrafted bird house. Be on the lookout for broken fingernail clippers.
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North Carolina supplied all the domestic gold coined for currency by the U.S. Mint in Philadelphia until 1828.
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