HKB
MY DEAR MALTHUS,
It is a prudent step in you to withdraw your concession, for I am sure that your theory could not stand with it. You find fault with my measure of value, you say, because it varies with the varying profits of other commodities. This is, I acknowledge, an imperfection in it when used to measure other commodities in which there enters more or less of profits than enters into my measure; but you do not appear to see that against your measure the same objection holds good, for your measure contains no profits at all, and therefore never can be an accurate measure of value for commodities which do contain profits. If I had no other arguments to offer against your measure, this which I am going to mention when used to you would be fatal to it. You say that my measure cannot measure commodities produced by labour alone. Granted; but, if it be true, how can your measure measure commodities produced with labour and profits united? You might just as well say that three times two are six and that twice three are not six, or that a foot measure was a good measure for a yard but a yard was not a good measure for a foot. If your measure will measure my commodity accurately, mine must do the same by yours. These are identical propositions, and I confess I see no answer that can be made to me. The fact really is that no accurate measure of absolute value can be found. No one doubts the desirableness of having one; but all we can ever hope to get is one tolerably well calculated to measure the greatest number of commodities, and therefore I should have no hesitation in admitting your measure to be the best, under all circumstances, if you could show that the greatest number of commodities were produced by labour alone without the intervention of capital. On the other hand, if a greater number of commodities are produced under the circumstances which I suppose to attend the production of the commodity which I choose for my measure, then mine would be the best measure. You will understand that in either case I suppose a degree of arbitrariness in the selection, and I only contend that it would be best employed in selecting mine.
When you say that my great mistake is in considering commodities made up of labour alone and not of labour and profits, I think the error is yours, not mine, for that is precisely what you do; you measure commodities by labour alone, which have both labour and profits in them. You surely will not say that my money, produced by labour and capital, and by which I propose to measure other things, omits profits. Yours does; what profits are there in shrimps or in gold picked up by daily labour, on account of the labourer, on the sea-shore? How much more justly then might this accusation be brought against you!