We might as well reasonably dispute whether it is the upper or under blade of a pair of scissors that cuts a piece of paper, as whether value is governed by [demand] or [supply].
- Alfred Marshall
Principles of Economics, 8th ed., 1920, p. 348.
The most famous law in economics, and the one economists are most sure of, is the law of demand. On this law is built almost the whole edifice of economics.
- David R. Henderson
"Demand," in The Fortune Encyclopedia of Economics, 1993.
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