From The Collaborative International Dictionary of English v.0.48 [gcide]:
The price which a person pays for a thing can never exceed, and seldom comes up to, that which he would be willing to pay rather than go without it. . . . The excess of the price which he would be willing to pay rather than go without it, over that which he actually does pay, is the economic measure of this surplus satisfaction. It has some analogies to a rent; but is perhaps best called simply consumer's surplus. --Alfred Marshall. [Webster 1913 Suppl.]
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