The Wealth of Nations by Part 2 Chapter 2 Page 117

beggarly bankers must be liable may occasion a very considerable inconveniency, and sometimes even a very great calamity to many poor people who had received their notes in payment.

It were better, perhaps, that no bank notes were issued in any part of the kingdom for a smaller sum than five pounds. Paper money would then, probably, confine itself, in every part of the kingdom, to the circulation between the different dealers, as much as it does at present in London, where no bank notes are issued under ten pounds’ value; five pounds being, in most parts of the kingdom, a sum which, though it will purchase, little more than half the quantity of goods, is as much considered, and is as seldom spent all at once, as ten pounds are amidst the profuse expense of London.