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Some coal mines, advantageously situated, cannot be wrought on

account of their barrenness. The produce does not pay the

expense. They can afford neither profit nor rent.

There are some, of which the produce is barely sufficient to pay

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

stock employed in working them. They afford some profit to the

undertaker of the work, but no rent to the landlord. They can be

wrought advantageously by nobody but the landlord, who, being

himself the undertaker of the work, gets the ordinary profit of

the capital which he employs in it. Many coal mines in Scotland

are wrought in this manner, and can be wrought in no other. The

landlord will allow nobody else to work them without paying some

rent, and nobody can afford to pay any.