“Exchange value forms the substance of money, and exchange value is wealth.”
Grundrisse (1857-1858)
Source: Notebook II, The Chapter on Money, p. 141.
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Karl Marx 290
German philosopher, economist, sociologist, journalist and … 1818–1883Related quotes

“Utility then is not the measure of exchangeable value, although it is absolutely essential to it.”
Source: The Principles of Political Economy and Taxation (1821) (Third Edition), Chapter I, Section I, On Value, p. 5

“Labour, therefore, is the real measure of the exchangeable value of all commodities”
Source: The Wealth of Nations (1776), Book I, Chapter V.
Context: Every man is rich or poor according to the degree in which he can afford to enjoy the necessaries, conveniences, and amusements of human life. But after the division of labour has once thoroughly taken place, it is but a very small part of these with which a man's own labour can supply him. The far greater part of them he must derive from the labour of other people, and he must be rich or poor according to the quantity of that labour which he can command, or which he can afford to purchase. The value of any commodity, therefore, to the person who possesses it, and who means not to use or consume it himself, but to exchange it for other commodities, is equal to the quantity of labour which it enables him to purchase or command. Labour, therefore, is the real measure of the exchangeable value of all commodities.

Le Commerce et le Gouvernement (1776), as quoted in Marx's Capital, Vol. I, Ch. 5.

Source: Money and Credit in Capitalist Economies, 1990, p. 10; Cited in Howard Stein. "Theories of institutions and economic reform in Africa." World Development 22.12 (1994): 1833-1849.

Source: On the Fetish Character in Music and the Regression of Listening (1938), p. 279

… It is not to be assumed that we offer for sale articles required for our own consumption. … We wish to part with a useless thing, in order to get one that we need; we want to give less for more. … It was natural to think that, in an exchange, value was given for value, whenever each of the articles exchanged was of equal value with the same quantity of gold. … But there is another point to be considered in our calculation. The question is, whether we both exchange something superfluous for something necessary.
Le Commerce et le Gouvernement (1776), as quoted in Marx's Capital, Vol. I, Ch. 5.
p, 125
The Morals of Economic Irrationalism (1920)