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Rh returned to him with the ordinary profit, and not whether any surplus will remain for rent. Even, therefore, if it were the fact, that there is never any land taken into cultivation, for which rent, and that too of an amount worth taking into consideration, was not paid; it would be true, nevertheless, that there is always some agricultural capital which pays no rent, because it returns nothing beyond the ordinary rate of profit: this capital being the portion of capital last applied—that to which the last addition to the produce was due: or (to express the essentials of the case in one phrase), that which is applied in the least favourable circumstances. But the same amount of demand, and the same price, which enable this least productive portion of capital barely to replace itself with the ordinary profit, enable every other portion to yield a surplus proportioned to the advantage it possesses. And this surplus it is, which competition enables the landlord to appropriate. The rent of all land is measured by the excess of the return to the whole capital employed on it, above what is necessary to replace the capital with the ordinary rate of profit, or in other words, above what the same capital would yield if it were all employed in as disadvantageous circumstances as the least productive portion of it; whether that least productive portion of capital is rendered so by being employed on the worst soil, or by being expended in extorting more produce from land which already yielded as much as it could be made to part with on easier terms.

It is not pretended that the facts of any concrete case conform with absolute precision to this or any other scientific principle. We must never forget that the truths of political economy are truths only in the rough: they have the certainty, but not the precision, of exact science. It is not, for example, strictly true that a farmer will cultivate no land, and apply no capital, which returns less than the ordinary profit. He will expect the ordinary profit on the bulk of his capital. But when he has cast in his lot with his farm, and bartered his skill and exertions, once for all, against what the farm