The Wealth of Nations by Part 4 Chapter 1 Page 56

With the same annual expense of labour and commodities, Europe can annually purchase about three times the quantity of plate which it could have purchased at that time. But when a commodity comes to be sold for a third part of what had been its usual price, not only those who purchased it before can purchase three times their former quantity, but it is brought down to the level of a much greater number of purchasers, perhaps to more than ten, perhaps to more than twenty times the former number. So that there may be in Europe at present not only more than three times, but more than twenty or thirty times the quantity of plate which would have been in it, even in its present state of improvement, had the discovery of the American mines never been made.

So far Europe has, no doubt, gained a real conveniency, though surely a