It is evident, therefore, that the values which determine what commodities shall be exported, and what imported, depend, as before stated, partly upon the quantity of labour employed in their production, partly upon the ordinary rates of profits in each country, and partly upon the value of money.
A sixth result illustrated in the Table is the important distinction between cost and value. The two last columns show the value of a given quantity of corn, and the value of the product of a given quantity of labour, under all the variations which may be supposed of fertility and corn wages. The difference between the numbers in the last column, and the uniform number expressing the value of labour, shows exactly the difference between the value of the labour which has been employed upon a production, or its cost, and the labour which that production will command, or its natural and exchangeable value; which, where profits and wages are alone concerned, must be exactly equal to the additional value occasioned by the amount of profits.
The reader will be aware that neither the preceding Table, nor any thing which has been said, tends in any degree to contradict the acknowledged truth that different kinds of labour are of very different natural and exchangeable value. It will be further allowed, that even the same kind of labour, and the kind which has been especially referred to, namely common agricultural labour, may, under particular circumstances, and in particular places, vary in value from a partial or temporary state of demand and supply. We well know, that, from a partial and temporary demand at a particular period of the year, summer wages are of a very different value from winter wages; but in reality summer wages form a very important part of the wages of the whole year. They are generally employed to pay the rent of the house, or to purchase the necessary clothing for the family. They could not be essentially diminished, without altering the condition of the labourer throughout the year, or the rate of the increase of population. And if the labourer earned a smaller quantity of corn throughout the year, with an undiminished produce, it appears from the Table that the value of that corn would still remain the same, owing to the increased value of those profits of which it was in part composed.
With regard to the variations in the value of labour in different parts of the same country, if they are not partial, or temporary, and consequently exceptions to the general average, they are all resolvable into those differences in the value of money, which unquestionably take place in different parts of the same country, and arise from a want of demand for corn and labour, and a want of commodities to exchange with those parts of the country which are richer in the precious metals.
Having obtained a measure of the value of commodities in their more simple forms, we may apply this measure to the ingredients which compose the most complicated productions, and estimate all the advances which consist of accumulated profits, rents, tithes, and taxes in labour. In the case of taxes on the wages of labour, or an increase in the prices of those other necessaries of the labourer, besides food, which may occasion the sale of a greater quantity of the produce, in order to pay the same number of labourers, as these increased advances will have the same effect upon profits as a simple increase of wages, they will in no respect interfere with the constant value of labour, though an increase of wages, under such circumstances, will be of no advantage to the labourer.
Cases will of course frequently occur, in which the advances which do not consist of wages vary in a different degree from wages; but still the value of labour will remain constant. If the produce, instead of being obtained by the direct labour of a certain number of men, were obtained by the direct labour of only a part of this number, together with an amount of materials, or other advances consumed in the same time, equal to the labour of the other part, then upon a rise in the corn wages of labour, if the other advances were to fall, or not to be worth so much labour as before, it is obvious that the profits of stock would not fall so much as if the same rise of corn wages had taken place, when all the advances had been in labour; and it might be thought at first that profits not falling in proportion to the rise of labour, the value of labour would not continue the same. But it will be observed, that, in all cases of this kind, there will be a less value of labour, which is equivalent to a less quantity of it employed to obtain the same produce; and a less quantity of labour altogether being consequently necessary to produce the food of the labourer, than if labour alone had been employed, the higher profits, or smaller diminution of the former profits, will only just be such as to maintain labour of a constant value.
Let us suppose, for instance, that 120 quarters of corn are produced by ten men. If each man were paid ten quarters, profits would be 20 per cent.; and if wages were increased to eleven quarters, profits would fall from 20 per cent. to 9.09 per cent. Now supposing, that, instead of ten men being directly employed, five only are so employed, and that the other advances consist of capital which will continue of the same value as the corn;[K] then, while each labourer earns ten quarters, and the other capital advanced is worth the labour of five men so paid, profits will be, as before, 20 per cent. But if the labourer be paid eleven quarters instead of ten, profits will not fall, as before, from 20 per cent. to 9.09 per cent., but only from 20 per cent. to 14.28 per cent.; because the advances, instead of being 110, will only be 105; and the value of these advances estimated in labour paid at eleven quarters each man, being only 9.54, instead of 10; 9.54 may be considered as the number of persons employed. Then if 120 quarters be produced by 9.54 men, 105 quarters will be produced by 8.34. But 8.34, increased by a profit of 14.28, will make 9.54, the quantity of labour employed, and show that the natural value of labour is always proportioned to its quantity. In the former case, when ten men were employed at eleven quarters, as the advances were 110 quarters, instead of 105, the labour required to produce the food of the labourer was 9.166, and consequently a profit of only 9.09 will be sufficient to make up ten, the number of men employed, and thus equalize the value with the quantity.
In the case of fixed capital of considerable duration, there is always a probability that it will alter in value in reference to the quantity of labour, and of profits estimated in labour, of which it was composed when first produced; but after having advanced so far in establishing the labour which a commodity will command, as the measure of its value, we are entitled to consider the present value estimated in labour of any fixed capital which is about to be employed in production, as representing the quantity of accumulated labour actually so applied. It is further necessary, as before stated, to reckon the remaining value of the fixed capital as a part of the produce resulting from the whole of the accumulated and immediate labour employed. When, however, these corrections have been made, all the cases in which fixed capital enters, which may be said to include the great mass of commodities, will be found to answer to the theory as accurately as the simplest case that can be stated.
The exceptions, therefore, to the general proposition that the labour which commodities will command may be considered as a standard measure of their value are only apparent, not real, and may all be consistently explained.
And if the proposition be true, a standard measure of value is of so much importance in political economy, and the one proposed is at all times so very ready and easy of application,[L] that there is scarcely any part of the science in which it will not tend to simplify and facilitate our inquiries.