The Wealth of Nations by Part 4 Chapter 1 Page 16

The prohibition of exporting gold and silver was in France and England confined to the coin of those respective countries. The exportation of foreign coin and of bullion was made free.

In Holland, and in some other places, this liberty was extended even to the coin of the country. The attention of government was turned away from guarding against the exportation of gold and silver to watch over the balance of trade as the only cause which could occasion any augmentation or diminution of those metals. From one fruitless care it was turned away to another care much more intricate, much more embarrassing, and just equally fruitless. The title of Mun’s book, England’s Treasure in Foreign Trade, became a fundamental maxim in the political economy, not of England only, but of all other commercial countries.