Equalization of Rates of Surplus Value
Marx believed that the long-term historical tendency would be for differences in rates of surplus value between enterprises and economic sectors to level out, as he explains in two places in Capital Vol. 3:
"If capitals that set in motion unequal quantities of living labour produce unequal amounts of surplus-value, this assumes that the level of exploitation of labour, or the rate of surplus-value, is the same, at least to a certain extent, or that the distinctions that exist here are balanced out by real or imaginary (conventional) grounds of compensation. This assumes competition among workers, and an equalization that takes place by their constant migration between one sphere of production and another. We assume a general rate of surplus value of this kind, as a tendency, like all economic laws, as a theoretical simplification; but in any case this is in practice an actual presupposition of the capitalist mode of production, even if inhibited to a greater or lesser extent by practical frictions that produce more or less significant local differences, such as the settlement laws for agricultural labourers in England, for example. In theory, we assume that the laws of the capitalist mode of production develop in their pure form. In reality, this is only an approximation; but that approximation is all the more exact, the more the capitalist mode of production is developed and the less it is adulterated by survivals of earlier economic conditions with which it is amalgamated " - Capital Vol. 3, ch. 10, Pelican edition p. 275.
So, he assumed a uniform rate of surplus value in his models of how surplus value would be shared out under competitive conditions.
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