Note 20 — Part III.—Of the variations in the Proportion between the respective Values of that sort of Produce which always affords Rent, and of that which sometimes does, and sometimes does not, afford Rent.
Reading edition
Postscript to the Universal Merchant, p. 15 and 16. This postscript was not printed till 1756, three years after the publication of the book, which has never had a second edition. The postscript is, therefore, to be found in few copies; it corrects several error in the book.