Carl-Menger

The value of a good is not determined by any inherent property of the good, nor by the amount of labor required to produce the good, but instead value is determined by the importance an acting individual places in a good for the achievement of their desired ends.
—  Carl Menger,
The Subjective Theory of Value
In science, there is only one sure method for the ultimate triumph of an idea: one should allow any contrary notion to run its course completely.
— 

Ludwig von Mises

Turns out it seems that it was actually father of the Austrian School Carl Menger who is quoted (by Hayek) as saying this.

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Principles of Economics: Carl Menger

Extracts from Carl Menger’s book “Principles of Economics”.

It was this book that kicked-off the Marginalist Revolution, which corrected theoretical errors of the old classical school. These errors concerned value theory, and they had sown enough confusion to make the dangerous ideology of Marxism seem more plausible than it really was. Menger set out to elucidate the precise nature of economic value, and root economics firmly in the real-world actions of individual human beings. For this reason, Carl Menger (1840-1921) was the founder of the Austrian School of economics. It is the book that Mises said turned him into a real economist. What’s striking is how nearly a century and a half later, the book still retains its incredible power, both in its prose and its relentless logic.

Menger advances his theory that the marginal utility of goods is the source of their value, not the labor inputs that went into making them. The implication is that the individual mind is the source of economic value, a point which started a revolution away from the flawed classical view of economics. Menger also covers property, price, time, production, and wealth. On money, for example, it was Menger who so beautifully explained how it originates not in social contract or legislation but within the framework of the market economy.

These bitches are on my dick. Hounding me for my money. I slick dick that makes ‘em stick. Look at this niggas trickin’ me out for some of that ass. Homey don’t play that way, bitch. Bitch ass niggaz don’t know where I am from. Born on the streets of Harlem. Ready to die, ready to flow, ready drop truths bombs like American drones over Pakistan like I was Obama’s first born son.
—  Carl Menger, An Austrian Century