The Wealth of Nations by Part 2 Chapter 2 Page 82

them repaid in their turn as soon as they became due; yet the value which had been really advanced upon the first bill, was never really returned to the banks which advanced it; because, before each bill became due, another bill was always drawn to somewhat a greater amount than the bill which was soon to be paid; and the discounting of this other bill was essentially necessary towards the payment of that which was soon to be due.

This payment, therefore, was altogether fictitious. The stream, which, by means of those circulating bills of exchange, had once been made to run out from the coffers of the banks, was never replaced by any stream which really run into them.

The paper which was issued upon those circulating bills of exchange, amounted, upon many occasions, to the whole fund