Let us analyze what happens in commercial banking. First, we have a deposit. Then, we have a loan of up to a fraction (of 90%) of this deposit. Finally, the borrower can deposit the borrowed money into another bank account, in the same bank or not. Suddenly, the trillion dollar question emerges: is the borrowed money in these two bank accounts... the same? On the one hand, the answer is yes: all borrowed money came from the original deposit---so it is that same original money. On the other hand, the answer is no: all money deposited into the borrower's account possibly stays in the original...