But as further the mass of surplusvalue which a single labourer produces, the value of labour power being given, is determined by the rate of the surplusvalue, this law follows: the mass of the surplusvalue produced is equal to the amount of the variable capital advanced, multiplied by the rate of surplusvalue, in other words: it is determined by the compound ratio between the number of labour powers exploited simultaneously by the same capitalist and the degree of exploitation of each individual labour power.