by entering in a greater degree into the cost of production of some things than of others, that they can have any influence on value.
For example, we have seen that there are causes which necessitate a permanently higher rate of profit in certain employments than in others. There must be a compensation for superior risk, trouble, and disagreeableness. This can only be obtained by selling the commodity at a value above that which is due to the quantity of labour necessary for its production. If gunpowder exchanged for other things in no higher ratio than that of the labour required from first to last for producing it, no one would set up a powder-mill. Butchers are certainly a more prosperous class than bakers, and do not seem to be exposed to greater risks, since it is not remarked that they are oftener bankrupts. They seem, therefore, to obtain higher profits, which can only arise from the more limited competition caused by the unpleasantness, and to a certain degree, the unpopularity, of their trade. But this higher profit implies that they sell their commodity at a higher value than that due to their labour and outlay. All inequalities of profit which are necessary and permanent, are represented in the relative values of the commodities.
§ 5.Profits, however, may enter more largely into the conditions of production of one commodity than of another, even though there be no difference in the rate of profit between the two employments. The one commodity may be called upon to yield profit during a longer period of time than the other. The example by which this case is usually illustrated is that of wine. Suppose a quantity of wine, and a quantity of cloth, made by equal amounts of labour, and that labour paid at the same rate. The cloth does not improve by keeping; the wine does. Suppose that, to attain the desired quality, the wine requires to be kept five years. The producer or dealer will not keep it, unless at the end of
