The Wealth of Nations by Part 4 Chapter 7 Page 169

By raising the rate of mercantile profit, the monopoly discourages the improvement of land. The profit of improvement depends upon the difference between what the land actually produces, and what, by the application of a certain capital, it can be made to produce. If this difference affords a greater profit than what can be drawn from an equal capital in any mercantile employment, the improvement of land will draw capital from all mercantile employments. If the profit is less, mercantile employments will draw capital from the improvement of land. Whatever, therefore, raises the rate of mercantile profit, either lessens the superiority or increases the inferiority of the profit of improvement; and in the one case hinders capital from going to improvement, and in the other draws capital from it.

But by discouraging