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WILLINGNESS TO PAY: The price or dollar amount that someone is willing to give up or pay to acquire a good or service. Willingness to pay is the source of the demand price of a good. However, unlike demand price, in which buyers are on the spot of actually giving up the payment, willingness to pay does not require an actual payment. This concept is important to benefit-cost analysis, welfare economics, and efficiency criteria, especially Kaldor-Hicks efficiency. A related concept is willingness to accept.

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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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