Thus, the separation and resolution of new value annually added by new labour to the means of production, or to the constant part of capital, into the various forms of revenue, viz., wages, profit and rent, do not at all alter the limits of the value itself, the total value to be distributed among these various categories; any more than a change in the mutual relations of these individual parts can change their total, this given magnitude of value. The given number 100 always remains the same, whether it is divided into 50 + 50, or into 20 + 70 + 10, or into 40 + 30 + 30. The portion of the value of the product which is resolved into these revenues is determined, just like the constant portion of the value of capital, by the value of the commodities, i.e., by the quantity of labour incorporated in them in each case. Given first, then, is the quantity of value of commodities to be divided among wages, profit and rent; in other words, the absolute limit of the sum of the portions of value of these commodities. Secondly, as concerns the individual categories themselves, their average and regulating limits are likewise given. Wages form the basis in this limitation. They are regulated on the one hand by a natural law; their lower limit is determined by the physical minimum of means of subsistence required by the labourer for the conservation of his labour-power and for its reproduction; i.e., by a definite quantity of commodities. The value of these commodities is determined by the labour-time required for their reproduction; and thus by the portion of new labour added to the means of production, or by the portion of each working-day required by the labourer for the production and reproduction of an equivalent for the value of these necessary means of subsistence. For instance, if his average daily means of subsistence have a value = 6 hours of average labour, then he must work on an average six hours per day for himself. The actual value of his labour-power deviates from this physical minimum; it differs according to climate and level of social development; it depends not merely upon the physical, but also upon the historically developed social needs, which become second nature. But in every country, at a given time, this regulating average wage is a given magnitude. The value of all other revenue thus has its limit. It is always equal to the value in which the total working-day (which coincides in the present case with the average working-day, since it comprises the total quantity of labour set in motion by the total social capital) is incorporated minus the portion of the working-day incorporated in wages. Its limit is therefore determined by the limit of the value in which the unpaid labour is expressed, that is, by the quantity of this unpaid labour. While the portion of the working-day which is required by the labourer for the reproduction of the value of his wages finds its ultimate limit in the physical minimum of wages, the other portion of the working-day, in which surplus-labour is incorporated, and thus the portion of value representing surplus-value, finds its limit in the physical maximum of the working-day, i.e., in the total quantity of daily labour-time during which the labourer can, in general, be active and still preserve and reproduce his labour-power. Since we are here concerned with the distribution of the value which represents the total labour newly added per year, the working-day may be regarded here as a constant magnitude, and is assumed as such, no matter how much or how little it may deviate from its physical maximum. The absolute limit of the portion of value which forms surplus-value, and which resolves itself into profit and ground-rent, is thus given. It is determined by the excess of the unpaid portion of the working-day over its paid portion, i.e., by the portion of the value of the total product in which this surplus-labour exists. If we call the surplus-value thus limited and calculated on the advanced total capital — the profit, as I have done, then this profit, so far as its absolute magnitude is concerned, is equal to the surplus-value and, therefore, its limits are just as much determined by law as the latter. On the other hand, the level of the rate of profit is likewise a magnitude held within certain specific limits determined by the value of commodities. It is the ratio of the total surplus-value to the total social capital advanced in production. If this capital = 500 (say millions) and the surplus-value = 100, then 20% constitutes the absolute limit of the rate of profit. The distribution of the social profit according to this rate among the capitals invested in the various spheres of production creates prices of production which deviate from the values of commodities and which are the real regulating average market-prices. But this deviation abolishes neither the determination of prices by values nor the regular limits of profit. Instead of the value of a commodity being equal to the capital consumed in its production plus the surplus-value contained in it, its price of production is now equal to the capital, c, consumed in its production plus the surplus-value falling to its share as a result of the general rate of profit, for instance 20% on the capital advanced in its production, counting both the consumed and the merely employed capital. But this additional amount of 20% is itself determined by the surplus-value created by the total social capital and its relation to the value of this capital; and for this reason it is 20% and not 10 or 100. The transformation of values into prices of production, then, does not remove the limits on profit, but merely alters its distribution among the various particular capitals which make up the social capital, i.e., it distributes it uniformly among them in the proportion in which they form parts of the value of this total capital. The market-prices rise above and fall below these regulating prices of production, but these fluctuations mutually balance each other. If one examines price lists over a more or less long period of time, and if one disregards those cases in which the actual value of commodities is altered by a change in the productivity of labour, and likewise those cases in which the process of production has been disturbed by natural or social accidents, one will be surprised, in the first place, by the relatively narrow limits of the deviations, and, secondly, by the regularity of their mutual compensation. The same domination of the regulating averages will be found here that Quetelet pointed out in the case of social phenomena. If the equalisation of the values of commodities into prices of production does not meet any obstacles, then the rent resolves itself into differential rent, i.e., it is limited to the equalisation of the surplus-profits which would he given to some capitalists by the regulating prices of production and which are now appropriated by the landlord. Here, then, rent has its definite limit of value in the deviations of the individual rates of profit, which are caused by the regulation of prices of production by the general rate of profit. If landed property obstructs equalisation of the values of commodities into prices of production, and appropriates absolute rent, then the latter is limited by the excess of the value of the agricultural products over their price of production, i.e., by the excess of the surplus-value contained in them over the rate of profit assigned to the capitals by the general rate of profit. This difference, then, forms the limit of the rent, which, as before, is but a definite portion of the given surplus-value contained in the commodities.