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Whether one deposits cash or a check, only 10% of it has to be held by the bank (or deposited into the banks reserve account at the fed) as required reserves. The rest can be utilized by the bank for whatever purpose, including lending it out. While my deposit is a bank liability, the money itself that I deposited is a bank asset. Reserves are an asset to a bank, so if I deposit cash/check or electronic money into a bank, that bank's reserve increases. As long as the banks total reserves are in excess of it's required reserves, then the bank simply transfers digits from it's own reserve account to the borrowers account (which may or may not be at the same bank). The bank didn't simply just add digits to the borrowers account, it added digits to the borrowers account AND subtracted an equivilent amount of digits from it's reserve account.
When you deposit a check for $1000, your bank gets $1000 transferred to their reserve account at the Fed. The bank never touches those reserves. Yes, by the rules, $100 of those reserves will be required, and $900 will be excess. But the bank does not transfer digits from its reserve account to borrower's account; if they did, they would be subtracting assets while adding liabilities. So for a $1000 loan, the bank would be down $2000; $1000 less reserves, and $1000 more account balances. That accounting doesn't work.
What does work is borrower's account balance being created in exchange for a promissory note.
The closest thing that works would be if borrower took out his loan in cash. So after marking up borrower's account by $1000 and holding borrower's promissory note as an asset worth, say, $1200, the loan is disbursed to borrower in cash; borrower's account balance goes down by $1000, and the bank's vault cash (reserves) also goes down by $1000. They are left with the soft asset, the promissory note, hopefully worth $1200. The bank, having disbursed the loan, is down $1000 of reserves, but up $1200 in promissory notes. Borrower's account balance is back to where it started.
But that is a disbursement, like any other disbursement, even if it's cash to borrower himself. The bank has settled up the loan by disbursing reserves and extinguishing borrower's account balance. The reserves only got involved upon disbursement, not upon loan creation.
The total reserves held by the fed may not change, but the lending banks reserves decreased (but is still above the required reserves).
If banks don't utilize depositors money, then where do banks get the money to lend to other banks on the interbank lending system?
Those are reserves. Bank A can move reserves to Bank B in return for repayment plus interest. That accounting works. It's like you lending me cash - nothing is created or extinguished, in a net sense.
If banks simply add digits to accounts to make a loan, without having to reduce digits in it's reserve account, then why would any bank ever need to borrow on the interbank lending system?
They add digits to accounts while at the same time getting a promissory note, which is the balancing asset.
It simply wouldn't be possible for a banks reserve to be below the required reserve, if banks held every penny of deposits in their reserve account at the fed, we wouldn't have a "fractional reserve banking system", we would have a 100% reserve banking system. But we all know that we have a fractional reserve system. If banks could not lend from reserves, then no depositors deposit would ever be at risk, and that government insurance on deposit account of up to $200k wouldn't even exist. Bank runs would be impossible, although people withdrawing their deposits would have to be willing to accept cashiers checks.
There is way more M1 money that there are reserves. It's no longer a 10-to-1 ratio, like before QE, but it's close. But there is really no close relationship between MB and M1. They are two separate, unmixable pools of money. **Except for people holding cash - but that is really just portable reserves. Instead of 100% of your money being in a bank account, when you take a cash withdrawal you are lowering the bank's liabilities, and the bank gives you reserves (cash) to settle up. Nobody's net position has changed.**
Remember that at the same time banks are taking deposits and increasing their reserve balances, they are also disbursing checks and lowering their reserve balances. While deposits bring in reserves in excess of the requirement, outgoing transfers lose reserves in excess of the requirement. You have to take them as a whole, and just worry about the net transfer at the end of the day. It very well might be zero, even if the bank has created more loans and increased the M1 money supply.