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Some natural productions require such a singularity of soil and

situation, that all the land in a great country, which is fit for

producing them, may not be sufficient to supply the effectual

demand. The whole quantity brought to market, therefore, may be

disposed of to those who are willing to give more than what is

sufficient to pay the rent of the land which produced them,

together with the wages of the labour and the profits of the

stock which were employed in preparing and bringing them to

market, according to their natural rates. Such commodities may

continue for whole centuries together to be sold at this high

price; and that part of it which resolves itself into the rent of

land, is in this case the part which is generally paid above its

natural rate.