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All those improvements in the productive powers of labour, which

tend directly to reduce the rent price of manufactures, tend

indirectly to raise the real rent of land. The landlord exchanges

that part of his rude produce, which is over and above his own

consumption, or, what comes to the same thing, the price of that

part of it, for manufactured produce. Whatever reduces the real

price of the latter, raises that of the former. An equal quantity

of the former becomes thereby equivalent to a greater quantity of

the latter; and the landlord is enabled to purchase a greater

quantity of the conveniencies, ornaments, or luxuries which he

has occasion for.