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Those other parts of the produce of land, however, which

afterwards afford rent, do not afford it always. Even in improved

and cultivated countries, the demand for them is not always such

as to afford a greater price than what is sufficient to pay the

labour, and replace, together with its ordinary profits, the

stock which must be employed in bringing them to market. Whether

it is or is not such, depends upon different circumstances.

Whether a coal mine, for example, can afford any rent, depends

partly upon its fertility, and partly upon its situation.

A mine of any kind may be said to be either fertile or barren,

according as the quantity of mineral which can be brought from it

by a certain quantity of labour, is greater or less than what can

be brought by an equal quantity from the greater part of other

mines of the same kind.