It has appeared also, that in the progress of cultivation and of increasing rents, rent, though greater in positive amount, bears a less, and lesser proportion to the quantity of capital employed upon the land, and the quantity of produce derived from it. According to the same principle, when produce diminishes and rents fall, though the amount of rent will always be less, the proportion which it bears to capital and produce will always be greater. And, as in the former case, the diminished proportion of rent was owing to the necessity of yearly taking fresh land of an inferior quality into cultivation, and proceeding in the improvement of old land, when it would return only the common profits of stock, with little or no rent; so, in the latter case, the high proportion of rent is owing to the impossibility of obtaining produce, whenever a great expenditure is required, and the necessity of employing the reduced capital of the country, in the exclusive cultivation of its richest lands. In proportion, therefore, as the relative state of prices is such as to occasion a progressive fall of rents, more and more lands will be gradually thrown out of cultivation, the remainder will be worse cultivated, and the diminution of produce will proceed still faster than the diminution of rents. If the doctrine here laid down, respecting the laws which govern the rise and fall of rents, be near the truth, the doctrine which maintains that, if the produce of agriculture were sold at such a price as to yield less net surplus, agriculture would be equally productive to the general stock, must be very far from the truth. With regard to my own conviction, indeed, I feel no sort of doubt that if, under the impression that the high price of raw produce, which occasions rent, is as injurious to the consumer as it is advantageous to the landlord, a rich and improved nation were determined by law, to lower the price of produce, till no surplus in the shape of rent anywhere remained; it would inevitably throw not only all the poor land, but all, except the very best land, out of cultivation, and probably reduce its produce and population to less than one tenth of their former amount. From the preceding account of the progress of rent, it follows, that the actual state of the natural rent of land is necessary to the actual produce; and that the price of produce, in every progressive country, must be just about equal to the cost of production on land of the poorest quality actually in use; or to the cost of raising additional produce on old land, which yields only the usual returns of agricultural stock with little or no rent.