The Wealth of Nations by Part 2 Chapter 2 Page 118

Where paper money, it is to be observed, is pretty much confined to the circulation between dealers and dealers, as at London, there is always plenty of gold and silver. Where it extends itself to a considerable part of the circulation between dealers and consumers, as in Scotland, and still more in North America, it banishes gold and silver almost entirely from the country; almost all the ordinary transactions of its interior commerce being thus carried on by paper. The suppression of ten and five shilling bank notes somewhat relieved the scarcity of gold and silver in Scotland; and the suppression of twenty shilling notes would probably relieve it still more. Those metals are said to have become more abundant in America since the suppression of some of their paper currencies. They are said, likewise, to have been more abundant before the institution of those currencies.