Karl Marx Substance Quotations

A commodity has a value because it is a crystallization of social labor. The greatness of its value, or its relative value, depends upon the greater or less amount of that social substance contained in it; that is to say, on the relative mass of labor necessary for its production.

Consumption is also immediately production, just as in nature the consumption of the elements and chemical substances is the production of the plant.

Exchange value forms the substance of money, and exchange value is wealth.