HKB
may be laid down as a principle uniformly true, that the only encouragement to the increased production of a commodity, is its market value exceeding its natural or necessary value.
But this is not the meaning which Mr. Malthus, on other occasions, attaches to the term, real price. In the Essay on Rent, Mr. Malthus says, by "the real growing price of corn, I mean the real quantity of labour and capital, which has been employed to produce the last additions which have been made to the national produce." In another part he states "the cause of the high comparative real price of corn to be the greater quantity of capital and labour, which must be employed to produce it."[59] Suppose that in the foregoing passage we were to substitute this definition of real price, would it not then run thus?--"It is clearly the increase in the quantity of labour and capital which must be employed to produce corn, which alone can encourage its production." This would be to say, that it is clearly the rise in the natural or necessary price of corn, which encourages its production--a proposition which could not be maintained. It is not the price at which corn can be produced, that has any influence on the quantity produced, but the price at which it can be sold. It is in proportion to the degree of the excess of its price above the cost of production, that capital is attracted to or repelled from the land. If that excess be such as to give to capital so employed, a greater than the general profit of stock, capital will go to the land; if less, it will be withdrawn from it.
It is not then by an alteration in the real price of corn that its production is encouraged, but by an alteration in its market price. It is not "because a greater quantity of capital and labour must be employed to produce it," Mr. Malthus's just definition of real price, that more capital and labour are attracted to the land, but because the market price rises above this its real price, and, notwithstanding the increased charge, makes the cultivation of land the more profitable employment of capital.
Nothing can be more just than the following observations of Mr. Malthus, on Adam Smith's standard of value. "Adam Smith was evidently led into this train of argument, from his habit of considering labour as the standard measure of value, and corn as the measure of labour. But that corn is a very inaccurate measure of labour, the history of our own country will amply demonstrate; where labour, compared with corn, will be found to have experienced very great and striking variations, not only from year to year, but from century to century; and for ten, twenty, and thirty years together. And that neither labour nor any other commodity can be an accurate measure of real value in exchange, is now considered as one of the most incontrovertible doctrines of political economy; and, indeed, follows from the very definition of value in exchange."
If neither corn nor labour are accurate measures of real value in exchange, which they clearly are not, what other commodity is?--certainly none. If then the expression real price of commodities, have any meaning, it must be that which Mr. Malthus has stated, in the Essay on Rent--it must be measured by the proportionate quantity of capital and labour necessary to produce them.
In Mr. Malthus's "Inquiry into the Nature of Rent," he says, "that, independently of irregularities in the currency of a country, and other temporary and accidental circumstances, the cause of the high comparative money price of corn, is its high comparative real price, or the greater quantity of capital and labour which must be employed to produce it."[60]