Authors:

When profit diminishes, merchants are very apt to complain that trade decays; though the diminution of profit is the natural effect of its prosperity, or of a greater stock being employed in it than before.

Adam Smith (2007). “The Wealth of Nations: An Inquiry into the Nature and Causes of the Wealth of Nations”, p.60, Harriman House Limited
When profit diminishes, merchants are very apt to complain that trade decays; though the diminution of profit is the natural effect of its prosperity, or of a greater stock being employed in it than before.