The Wealth of Nations by Part 4 Chapter 4 Page 2

Such encouragements do not tend to turn towards any particular employment a greater share of the capital of the country than what would go to that employment of its own accord, but only to hinder the duty from driving away any part of that share to other employments. They tend not to overturn that balance which naturally establishes itself among all the various employments of the society; but to hinder it from being overturned by the duty. They tend not to destroy, but to preserve what it is in most cases advantageous to preserve, the natural division and distribution of labour in the society.

The same thing may be said of the drawbacks upon the re-exportation of foreign goods imported, which in Great Britain generally amount to by much the largest part of the duty upon importation.