_Phæd_. I see "lots" of 150s and 140s, and other ill-looking people of the same description. _X_. Well, these numbers express the products of the same labor on land of different qualities. The quantity of labor is assumed to be always the same; namely, the labor of ten men for a year (or one man for ten years, or twenty men for half a year, etc.). The producing labor, I say, is always the same; but the product is constantly varying. Thus, in the case Alpha the product is one hundred and fifty quarters; in the cases Delta and Epsilon, when cultivation has been compelled by increasing population to descend upon inferior land, the product of equal labor is no more than one hundred and forty quarters; and in the case Iota it has fallen to one hundred and twenty quarters. Now, upon Mr. Ricardo's principle of valuation, I demand to know what ought to be the price of these several products which vary so much in quantity. _Phæd_. Why, since they are all the products of the same quantity of labor, they ought all to sell for the same price. _X_. Doubtless; not, however, of necessity for the same money price, since money may itself have varied, in which case the same money price would be really a very different price; but for the same price in all things which have _not_ varied in value. The Xi product, therefore, which is only ninety quarters, will fetch the same real price as the Alpha or Gamma products, which are one hundred and fifty. But, by the way, in saying this, let me caution you against making the false inference that corn is at the same price in the case Xi as in the case Alpha or Gamma; for the inference is the very opposite; since, if ninety quarters cost as much as one hundred and fifty, then each individual quarter of the ninety costs a great deal more. Thus, suppose that the Alpha product sold at four pounds a quarter, the price of the whole would be six hundred pounds. Six hundred pounds, therefore, must be the price of Xi, or the ninety quarters; but _that_ is six pounds, thirteen shillings, four pence, a quarter. This ought to be a needless caution; yet I have known economists of great name stand much in need of it. _Phæd_. I am sure _I_ stand in need of it, and of all sort of assistance, for I am "ill at these numbers." But let us go on; what you require my assent to, I understand to be this: that all the different quantities of corn expressed in the first column will be of the same value, because they are all alike the product of ten men's labor. To this I _do_ assent; and what next? Does anybody deny it? _X_. Yes, Mr. Malthus: he asserts that the value will not be always the same; and the purpose of the ninth column is to assign the true values; which, by looking into that column, you may perceive to be constantly varying: the value of Alpha, for instance, is twelve and five tenths; the value of Epsilon is twelve and seven tenths; of Iota, twelve; and of Xi, eleven and twenty-five one-hundredths.