The Wealth of Nations by Part 4 Chapter 5 Page 19

It is the peculiar situation of Spain and Portugal as proprietors of the mines to be the distributors of gold and silver to all the other countries of Europe. Those metals ought naturally, therefore, to be somewhat cheaper in Spain and Portugal than in any other part of Europe. The difference, however, should be no more than the amount of the freight and insurance; and, on account of the great value and small bulk of those metals, their freight is no great matter, and their insurance is the same as that of any other goods of equal value. Spain and Portugal, therefore, could suffer very little from their peculiar situation, if they did not aggravate its disadvantages by their political institutions.

Spain by taxing, and Portugal by prohibiting the exportation of gold and silver, load that exportation with the expense of