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.