The Wealth of Nations by Part 4 Chapter 7 Page 225

employments which in ordinary cases are more advantageous, and turned towards one which in ordinary cases is less advantageous to the public; and in this extraordinary case the natural interests and inclinations of men coincide as exactly with the public interest as in all other ordinary cases, and lead them to withdraw stock from the near, and to turn it towards the distant employment.

It is thus that the private interests and passions of individuals naturally dispose them to turn their stocks towards the employments which in ordinary cases are most advantageous to the society.

But if from this natural preference they should turn too much of it towards those employments, the fall of profit in them and the rise of it in all others immediately dispose them to alter this faulty