Well, ideally it should work like this:
1 BTC is lent by Alice to John
John re-lends it to Joe
Joe pays back john 1 BTC, who then settles his debt with Alice with that same 1 BTC.
Alice to John then to Joe, but why would Joe borrow just to return the 1 BTC in existence? He wants to buy something. He buys a car, from luis. Luis saves the BTC.....
