ABSTRACT
Productive labour, in the meaning of capitalist production, is wage labour which, exchanged against the variable part of capital (the part of the capital that is spent on wages), reproduces not only this part of the capital (or the value of its own labour capacity), but in addition produces surplus value for the capitalist [ ... ] Only that wage labour is productive which produces capital [ ... ] Consequently, only that labour capacity is productive which produces a value greater than its own.
