" Conversely, from the standpoint of the circulation process, the distinction between fixed and circulating capital, it is just as immaterial in what proportion a given value of circulating capital is divided between material of labour and wages. From the one standpoint, the material of labour is ranked in the same category as the means of labour, as opposed to the capital value laid out on labour-power. From the other standpoint, the part of capital laid out on labour-power is ranked together with that laid out on material of labour, as opposed to the part of capital laid out on means of labour. "

― Karl Marx , Capital: A Critique of Political Economy, Volume 2