17.It sometimes happens, indeed, that the quantity of land which can be fitted for some particular produce, is too small to supply the effectual demand.
19.Such people may be called the effectual demanders, and their demand the effectual demand; since it maybe sufficient to effectuate the bringing of the commodity to market.
20.The whole quantity of industry annually employed in order to bring any commodity to market, naturally suits itself in this manner to the effectual demand.