The Wealth of Nations by Part 4 Chapter 9 Page 24

The merchants, artificers, and manufacturers of those mercantile states which, like Holland and Hamburg, consist chiefly of this unproductive class, are in the same manner maintained and employed altogether at the expense of the proprietors and cultivators of land. The only difference is, that those proprietors and cultivators are, the greater part of them, placed at a most inconvenient distance from the merchants, artificers, and manufacturers whom they supply with the materials of their work and the fund of their subsistences- the inhabitants of other countries and the subjects of other governments.

Such mercantile states, however, are not only useful, but greatly useful to the inhabitants of those other countries.

They fill up, in some measure, a very important void, and supply the