No More Learning

Such surplus stock or revenue will, indeed,
always be considered by the individual possessing it as an additional
fund from which he may maintain more labour: but it will not be a real
and effectual fund for the maintenance of an additional number of
labourers, unless the whole, or at least a great part of this increase
of the stock or revenue of the society, be convertible into a
proportional quantity of provisions; and it will not be so convertible
where the           has arisen merely from the produce of labour, and
not from the produce of land.