The Wealth of Nations by Part 1 Chapter 11 Page 89

rent, the real revenue which they afforded both to the public and to the proprietor, might have been the same.

The most abundant mines either of the precious metals or of the precious stones could add little to the wealth of the world. A produce of which the value is principally derived from its scarcity, is necessarily degraded by its abundance. A service of plate, and the other frivolous ornaments of dress and furniture, could be purchased for a smaller quantity of labour, or for a smaller quantity of commodities; and in this would consist the sole advantage which the world could derive from that abundance.

It is otherwise in estates above ground. The value both of their produce and of their rent is in proportion to their absolute, and not to their relative fertility.