In itself, the magnitude of value of total capital has no inner relationship to the magnitude of surplus-value, at least not directly. So far as its material elements are concerned, the total capital minus the variable capital, that is, the constant capital, consists of the material requisites — the means of labour and materials of labour — needed to materialise labour. It is necessary to have a certain quantity of means and materials of labour for a specific quantity of labour to materialise in commodities and thereby to produce value. A definite technical relation depending on the special nature of the labour applied is established between the quantity of labour and the quantity of means of production to which this labour is to be applied. Hence there is also to that extent a definite relation between the quantity of surplus-value, or surplus-labour, and the quantity of means of production. For instance, if the labour necessary for the production of the wage amounts to a daily 6 hours, the labourer must work 12 hours to do 6 hours of surplus-labour, or produce a surplus-value of 100%. He uses up twice as much of the means of production in 12 hours as he does in 6. Yet this is no reason for the surplus-value produced by him in 6 hours to be directly related to the value of the means of production used up in those 6, or in 12 hours. This value is here altogether immaterial; it is only a matter of the technically required quantity. It does not matter whether the raw materials or means of labour are cheap or dear, as long as they have the required use-value and are available in technically prescribed proportion to the labour to be applied. If I know that x lbs. of cotton are consumed in an hour of spinning and that they cost a shillings, then, of course, I also know that 12 hours' spinning consumes 12x lbs. of cotton = 12 a shillings, and can then calculate the proportion of the surplus-value to the value of the 12 as well as to that of the 6. But the relation of living labour to the value of means of production obtains here only to the extent that a shillings serve as a name for x lbs. of cotton; because a definite quantity of cotton has a definite price, and therefore, conversely, a definite price may also serve as an index for a definite quantity of cotton, so long as the price of cotton does not change. If I know that the labourer must work 12 hours for me to appropriate 6 hours of surplus-labour, that therefore I must have a 12-hour supply of cotton ready for use, and if I know the price of this quantity of cotton needed for 12 hours, then I have an indirect relation between the price of cotton (as an index of the required quantity) and the surplus-value. But, conversely, I can never conclude the quantity of the raw material that may be consumed in, say, one hour, and not 6, of spinning from the price of the raw material. There is, then, no necessary inner relation between the value of the constant capital, nor, therefore, between the value of the total capital (=c+v) and the surplus-value.