AC << >> Chapter 6: The Sale and Purchase of Labour Power Page 279 The process of the consumption of labourpower is at the same time the production process of commodities and of surplus-value. The consumption of labour-power is completed, as in the case of every other commodity, outside the market or the sphere of circulation. Let us therefore, in company with the owner of money and the owner of labour-power, leave this noisy sphere, where everything takes place on the surface and in full view of everyone, and follow them into the hidden abode of production, on whose threshold there hangs the notice ' No admittance except on business'. Here we shall see, not only how capital produces, but how capital is itself produced. The secret of profit-making must at last be laid bare.