The Wealth of Nations by Part 4 Chapter 1 Page 57

very trifling one. The cheapness of gold and silver renders those metals rather less fit for the purposes of money than they were before. In order to make the same purchases, we must load ourselves with a greater quantity of them, and carry about a shilling in our pocket where a groat would have done before. It is difficult to say which is most trifling, this inconveniency or the opposite conveniency. Neither the one nor the other could have made any very essential change in the state of Europe. The discovery of America, however, certainly made a most essential one. By opening a new and inexhaustible market to all the commodities of Europe, it gave occasion to new divisions of labour and improvements of art, which in the narrow circle of the ancient commerce, could never have taken place for want of a market to take off the greater part of their produce.