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circumstances of production of the things against which it was exchanged. But if there existed such a commodity, we should derive this advantage from it, that whenever any other thing varied in relation to it, we should know that the cause of variation was not in it, but in the other thing. It would thus be fitted to serve as a measure, not indeed of the value of other things, but of their cost of production. If a commodity acquired a greater permanent purchasing power in relation to the invariable commodity, its cost of production must have become greater; and in the contrary case, less. This measure of cost, is what political economists have generally meant by a measure of value.

But a measure of cost, though perfectly conceivable, can no more exist in fact, than a measure of exchange value. There is no commodity which is invariable in its cost of production. Gold comes nearest to the idea; but gold is liable to vary in cost of production, from the exhaustion of old mines, the discovery of new, and improvements in the mode of working. If we attempt to ascertain the changes in the cost of production of any commodity from the changes in its money price, the conclusion will require to be corrected by the best allowance we can make for the intermediate changes in the cost of the production of money itself.

Adam Smith fancied that there were two commodities peculiarly fitted to serve as a measure of value: corn, and labour. Of corn, he said that although its value fluctuates much from year to year, it does not vary greatly from century to century. This we now know to be an error: corn tends to rise in cost of production with every increase of population, and to fall with every improvement in agriculture, either in the country itself, or in any foreign country from which it draws a portion of its supplies. The supposed constancy of the cost of the production of corn depends on the maintenance of a complete equipoise between these antagonizing forces, an equipoise which, if ever realized, can only be accidental. With respect to labour as a measure of value, the language of

Adam Smith is not uniform. He sometimes speaks of it as a good measure only for short periods, saying that the value of labour (or wages) does not vary much from year to year, though it does from generation to generation. On other occasions he speaks as if labour were intrinsically the most proper measure of value, on the ground that one day's ordinary muscular exertion of one man, may be looked upon as always, to him, the same amount of effort or sacrifice. But this proposition, whether in itself admissible or not, discards the idea of exchange value altogether, substituting a totally different idea, more analogous to value in use. If a day's labour will purchase in America twice as much of ordinary consumable articles as in England, it seems a vain subtlety to insist on saying that labour is of the same value in both countries, and that it is the value of the other things which is different. Labour, in this case, may be correctly said to be twice as valuable, both in the market and to the labourer himself, in America as in England.

If the object were to obtain an approximate measure by which to estimate value in use, perhaps nothing better could be chosen than one day's subsistence of an average man, reckoned in the ordinary food consumed by the class of unskilled labourers. If in America a pound of maize flour will support a labouring man for a day, a thing might be deemed more or less valuable in proportion to the number of pounds of maize flour it exchanged for. If one thing, either by itself or by what it would purchase, could maintain a labouring man for a day, and another could maintain him for a week, there would be some reason in saying that the one was worth, for ordinary human uses, seven times as much as the other. But this would not measure the worth of the thing to its possessor for his own purposes, which might be greater to any amount, though it could not be less, than the worth of the food which the thing would purchase.

The idea of a Measure of Value must not be confounded with the idea of the regulator, or determining principle, of

value. When it is said by Ricardo and others, that the value of a thing is regulated by quantity of labour, they do not mean the quantity of labour for which the thing will exchange, but the quantity required for producing it. This, they mean to affirm, determines its value; causes it to be of the value it is, and of no other. But when Adam Smith and Malthus say that labour is a measure of value, they do not mean the labour by which the thing was or can be made, but the quantity of labour which it will exchange for, or purchase; in other words, the value of the thing, estimated in labour. And they do not mean that this regulates the general exchange value of the thing, or has any effect in determining what that value shall be, but only ascertains what it is, and whether and how much it varies from time to time and from place to place. To confound these two ideas, would be much the same thing as to overlook the distinction between the thermometer and the fire.

CHAPTER XVI.

OF SOME PECULIAR CASES OF VALUE.

§ 1. THE general laws of value, in all the more important cases of the interchange of commodities in the same country, have now been investigated. We examined, first, the case of monopoly, in which the value is determined by either a natural or an artificial limitation of quantity, that is, by demand and supply: secondly, the case of free competition, when the article can be produced in indefinite quantity at the same cost; in which case the permanent value is determined by the cost of production, and only the fluctuations by supply and demand: thirdly, a mixed case, that of the articles which can be produced in indefinite quantity, but not at the same cost; in which case the permanent value is determined by the greatest cost which it is necessary to incur in order to obtain the required supply. And lastly, we have found that money itself is a commodity of the third class; that its value, in a state of freedom, is governed by the same laws as the values of other commodities of its class; and that prices, therefore, follow the same laws as values.

From this it appears that demand and supply govern the fluctuations of values and prices in all cases, and the permanent values and prices of all things of which the supply is determined by any agency other than that of free competition: but that, under the regime of competition, things are, on the average, exchanged for each other at such values, and sold at such prices, as afford equal expectation of advantage to all classes of producers; which can only be when things exchange for one another in the ratio of their cost of production.

It is now, however, necessary to take notice of certain

cases, to which, from their peculiar nature, this law of exchange value is inapplicable.

It sometimes happens that two different commodities have what may be termed a joint cost of production. They are both products of the same operation, or set of operations, and the outlay is incurred for the sake of both together, not part for one and part for the other. The same outlay would have to be incurred for either of the two, if the other were not wanted or used at all. There are not a few instances of commodities thus associated in their production. For example, coke and coal-gas are both produced from the same material, and by the same operation. In a more partial sense, mutton and wool are an example: beef, hides, and tallow: calves and dairy produce: chickens and eggs. Cost of production can have nothing to do with deciding the value of the associated commodities relatively to each other. It only decides their joint value. The gas and the coke together have to repay the expenses of their production, with the ordinary profit. To do this, a given quantity of gas, together with the coke which is the residuum of its manufacture, must exchange for other things in the ratio of their joint cost of production. But how much of the remuneration of the producer shall be derived from the coke, and how much from the gas, remains to be decided. Cost of production does not determine their prices, but the sum of their prices. A principle is wanting to apportion the expenses of production between the two.

Since cost of production here fails us, we must revert to a law of value anterior to cost of production, and more fundamental, the law of demand and supply. The law is, that the demand for a commodity varies with its value, and that the value adjusts itself so that the demand shall be equal to the supply. This supplies the principle of repartition which we are in quest of.

Suppose that a certain quantity of gas is produced and sold at a certain price, and that the residuum of coke is

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