The Wealth of Nations by Part 2 Chapter 2 Page 120

exchange, and partly by lending upon cash accounts, banks and bankers might still be able to relieve the greater part of those dealers from the necessity of keeping any considerable part of their stock by them, unemployed and in ready money, for answering occasional demands.

They might still be able to give the utmost assistance which banks and bankers can, with propriety, give to traders of every kind.

To restrain private people, it may be said, from receiving in payment the promissory notes of a banker, for any sum whether great or small, when they themselves are willing to receive them, or to restrain a banker from issuing such notes, when all his neighbours are willing to accept of them, is a manifest violation of that natural liberty which it is the proper business of law not to