M Gillespie

“Capital consists not only of means of subsistence, instruments of labour and raw materials, not only of material products; it consists just as much of exchange values. All the products of which it consists are commodities. Capital is, therefore, not only a sum of material products; it is a sum of commodities, of exchange values, of social magnitudes.”
― Karl Marx, Wage-Labour and Capital and Value, Price, and Profit