The Wealth of Nations by Part 4 Chapter 7 Page 222

which they are distant and slow; naturally courts the employment in which it can maintain the greatest quantity of productive labour in the country to which it belongs, or in which its owner resides, and shuns that in which it can maintain there the smallest quantity.

It naturally courts the employment which in ordinary cases is most advantageous, and shuns that which in ordinary cases is least advantageous to that country.

But if in any of those distant employments, which in ordinary cases are less advantageous to the country, the profit should happen to rise somewhat higher than what is sufficient to balance the natural preference which is given to nearer employments, this superiority of profit will draw stock from those nearer employments, till the profits of all return to their