For analogous reasons, cost enters but partially into the determination of the value of such goods as are dependent more or less on luck or chance for their production, as in the case of precious stones, gold, silver, etc. _The Standard of Value._ We may use the value of anything as a measure by which to compare the values of any and all other things, but as all the factors that determine value are variable, the value of everything is variable. Any value may rise with reference to some other value, and at the same time fall with reference to a third. By what standard, or invariable measure at all times and places, can we compare the values of goods to determine their constancy or variability? We must not forget that there are two kinds of value, and that it is a standard of exchange value we are seeking. So far as it may be possible to formulate a standard of subjective value, it must consist of the pain or inutility of labour; for this kind of value pertains only to a single good, and cannot be referred to other goods without confusing it with the other conception. We cannot measure the absolute pleasure a good will give to an individual except by the pain he will undergo to get it. It is not a standard for this sort of value we want. It was evidently some such conception as the above--confusing, however, not only the two kinds of value but the two descriptions of labour--that led Adam Smith to consider labour as the ultimate standard of value. He appears also to have confused the idea of a standard of value with that of a determiner of value. These errors were pointed out in part by Ricardo and, in part also, by J. S. Mill and later writers; hence the contention that labour is in any way a standard of value has long been abandoned by the ablest economists. The idea still lingers, however, and is frequently brought forward in current discussions, and for this reason it seems necessary to analyze briefly the relation of labour to value. Labour is necessary to the production of all commodities, but it is not itself a commodity, nor anything which for itself is desired. It is a force, and, like every force, valuable according to the results it accomplishes. If unproductive, it has no value; if productive, its value varies according to the value of the commodities or utilities it creates. We use the terms "price of labour" or "value of labour," implying that it is the labour which is valued, and which is bought and sold; but the terms are merely a convenience. What is really bought and sold is the commodity or utility such labour has produced or will produce. If it were the labour itself, then the purchaser would receive not only the labour, but the commodity it produced, in exchange for the wages paid,--a double return,--which, of course, is absurd. Three descriptions of labour may be distinguished in connection with the value of a commodity, viz.:-- (1) The labour expended in its production.