The Wealth of Nations by Part 2 Chapter 4 Page 25

certain difference only; and if the rent of land should fall short of the interest of money by a greater difference, nobody would buy land, which would soon reduce its ordinary price. On the contrary, if the advantages should much more than compensate the difference, everybody would buy land, which again would soon raise its ordinary price. When interest was at ten per cent, land was commonly sold for ten and twelve years’ purchase. As interest sunk to six, five, and four per cent, the price of land rose to twenty, five-and-twenty, and thirty years’ purchase.

The market rate of interest is higher in France than in England; and the common price of land is lower. In England it commonly sells at thirty, in France at twenty years’ purchase.