
Szabo has also laid an extensive argument for bitcoin to function as a settlement system and the purpose and value of it and Finney also discussed this based George Selgins observations and writings/teachings:

I believe this will be the ultimate fate of Bitcoin, to be the "high-powered money" that serves as a reserve currency for banks that issue their own digital cash. Most Bitcoin transactions will occur between banks, to settle net transfers.~https://bitcointalk.org/index.php?topic=2500.msg34211#msg34211