The Wealth of Nations by Part 2 Chapter 2 Page 115

Paper money may be so regulated as either to confine itself very much to the circulation between the different dealers, or to extend itself likewise to a great part of that between the dealers and the consumers. Where no bank notes are circulated under ten pounds value, as in London, paper money confines itself very much to the circulation between the dealers. When a ten pound bank note comes into the hands of a consumer, he is generally obliged to change it at the first shop where he has occasion to purchase five shillings’ worth of goods, so that it often returns into the hands of a dealer before the consumer has spent the fortieth part of the money. Where bank notes are issued for so small sums as twenty shillings, as in Scotland, paper money extends itself to a considerable part of the circulation between dealers and consumers.