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“A use-value, or useful article, therefore, has value only because abstract human labour is objectified or materialized in it. How, then, is the magnitude of value to be measured? By means of the quantity of the "value-forming substance", the labour, contained in the article. This quantity is measured by its duration, and the labour-time is itself measured on the particular scale of hours, days etc.”
― Karl Marx, Capital: A Critique of Political Economy Volume 1

“As use-values, commodities differ above all in quality, while as exchange-values they can only differ in quantity, and therefore do not contain an atom of use-value.”
― Karl Marx, Capital: A Critique of Political Economy Volume 1

“Cuando no se produce ya para el valor de uso sino únicamente para el valor de cambio, cuando el trabajo no sirve para satisfacer ninguna necesidad concreta sino solamente para fabricar unos objetos cualesquiera para venderlos en el mercado (lo que Marx llamó "trabajo abstracto"), entonces la abstracción, lo puramente cuantitativo, el predominio de la forma, y concretamente de la forma-mercancía, sobre cualquier contenido, determinan la entera vida social. El valor de cambio, la simple cantidad de trabajo social que se ha incorporado a una mercancía, es el triunfo de la cantidad, de la abstracción de toda cualidad.”
― Anselm Jappe, El absurdo mercado de los hombres sin cualidades: Ensayos sobre el fetichismo de la mercancía

“A use-value, or useful article, therefore, has value only because abstract human labour is objectified or materialized in it. How, then, is the magnitude of this value to be measured? By means of the quantity of the "value-forming substance", the labour, contained in the article. This quantity is measured by its duration, and the labour-time is itself measured on the particular scale of hours, days etc.”
― Karl Marx, Capital: A Critique of Political Economy Volume 1