[cut sifted ephedra sinica]

Good questions about Amy's actual currency.

In real life, Angus Bank would only keep enough of Amy's FRNs such that they could cover cash withdrawals, and then they would send the rest to their regional Federal Reserve Bank. If they later needed more FRNs, they would request some back from the Federal reserve as necessary, with all of the proper accounting done digitally. All other subsequent transactions with the other borrowers and banks would be via bank checks and digital accounting.

For illustrative purposes, though, you could envision that all borrowers wanted to be paid in cash, so that in the end, 100 FRNs ended up at Angus Bank, 90 at Beta, and 810 at Cantina. Then, Cantina would send some of them to the Federal Reserve.