“The general theory of economic equilibrium was strengthened and made effective as an organon of thought by two powerful subsidiary conceptions — the Margin and Substitution. The notion of the Margin was extended beyond [Utility]] to describe the equilibrium point in given conditions of any economic factor which can be regarded as capable of small variations about a given value, or in its functional relation to a given value.”

—  John Maynard Keynes

Source: Essays In Biography (1933), Alfred Marshall, p. 223

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John Maynard Keynes 122
British economist 1883–1946

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" Gerard Debreu - Biographical http://www.nobelprize.org/nobel_prizes/economic-sciences/laureates/1983/debreu-bio.html". in: Les Prix Nobel. The Nobel Prizes 1983, Editor Wilhelm Odelberg, [Nobel Foundation], Stockholm, 1984; Republished at Nobelprize.org. Nobel Media AB 2014.

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