The Wealth of Nations by Part 4 Chapter 9 Page 26

The most effectual expedient, on the contrary, for raising the value of that surplus produce, for encouraging its increase, and consequently the improvement and cultivation of their own land would be to allow the most perfect freedom to the trade of all such mercantile nations.

This perfect freedom of trade would even be the most effectual expedient for supplying them, in due time, with all the artificers, manufacturers, and merchants whom they wanted at home, and for filling up in the properest and most advantageous manner that very important void which they felt there.

The continual increase of the surplus produce of their land would, in due time, create a greater capital than what could be employed with the ordinary rate of profit in the improvement and cultivation of land; and the