Econ4Every1
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- Aug 7, 2017
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- #61
Then what good are reserves?
Reserves are simply settlement funds.
The Fed can manipulate the supply of money in the broader economy just by manipulating a relatively small amount of reserves via monetary policy.
The Fed can increase or decrease the level of reserves which in turn affects the cost of lending. The Fed can also manipulate the reserve requirement itself.
The much longer answer is:
All central banks provide or oversee the interbank payments system in their country, which is the system that transfers deposit liabilities from one bank to another when customers write checks or use their ATM cards.
We all use double-entry bookkeeping, so the method for clearing payments between banks is essentially the same in all modern economies.
If there are two banks in a system, each of which cashes checks from the other, then each transaction creates an obligation by one bank to pay the other. If we were very inefficient, we could send a courier from one bank to the other every time a check was deposited, to return the check to the bank on which it was drawn, and to return with a sack of cash in the amount of the check.
If we're thinking a little more efficiently, we can agree to send one courier at the end of each day, with all the checks accepted that day, and we can total up the checks deposited by each bank on the accounts of the other, then compare the totals. We will subtract the smaller amount of checks from the larger, and whichever bank had cashed the smaller amount of checks would owe one "net" amount of money to the other bank. That “deficit” bank can send a courier with a small sack of cash to settle the net amount - even though we may have cashed millions of dollars' worth of each other's checks that day, the net amount owed by the deficit bank to the “surplus” bank might be very, very small.
Now if we're being even MORE efficient, we can agree that each of us would open a checking account at the other's bank - so one bank opens a checking account in the other, and vice versa - rather than having to send our courier with the sack with the net amount of cash every day, we just have the deficit bank create a deposit for the net in the account of the surplus bank. At the end of the next day, if yesterday’s deficit bank is now the surplus bank, it can just reduce the “funds” the other bank has “on deposit” with it. If that bank’s surplus is greater than the balance in the deficit bank’s account, the new deficit bank can simply create a balance in the surplus bank’s account to make things add up.
Notice that each of these banks now has funds “on deposit” with the other bank, but neither bank has actually made a deposit in the other bank. The deficit bank simply creates a deposit “out of thin air!” for the surplus bank as a method to keep score between them.
We are now using these two checking accounts to settle our affairs every day, so no money is actually changing hands between us at all unless one of us becomes so severely deficit to the other that we agree we probably ought to settle the net in cash. But in the main, neither of us ever expects to withdraw those settlement funds so that we can lend them to anyone, or to do anything else with them. They are simply there as a scorekeeping mechanism so that we can process each others' payments. That’s pretty efficient.
Of course, there are always more than two banks, so all banks have to do this with all other banks if they are going to all be able to accept each others’ checks. We could do this - have every bank create an account with every other bank for the purposes of settlement. That's certainly better than having bicycle couriers transferring sacks of checks and sacks of cash every day, but we can still see more obvious efficiencies to be had.
What if we created a banker's bank, and ALL of us opened an account with that bank? Then, rather than each bank having to have an account with every other bank in order to settle payments, it would only need ONE account, with the "central" bank.
Well, this is great! Now what we do is hire a bookkeeper (call him a clearinghouse), and we report every day to him with the number of checks we have received in deposit from accounts drawn on other banks.
We don't even care WHICH banks those checks are drawn on. As long as every bank honestly reports the total value of all checks it has cashed (which they have an incentive to do - they wouldn't under-report, because they would short themselves, and they wouldn't over-report, because they have to provide the cancelled checks as evidence), then all we have to do is report ONE net number for all our checking transactions. We can tell the clearinghouse how many checks we accepted from all other banks today, and we can tell them how many of our canceled checks we received from all other banks, and - voila! We know instantly what we owe to "all other banks" or what "all other banks" owe to us. It’s just one net number, and it’s a lot smaller than the number of transactions we processed throughout the day.
Once the clearinghouse has a tally of every bank's net, it simply hands the list to the central bank, which begins the merry work of either reducing or increasing the settlement fund account balance of every bank in the system by the amount reported by the clearinghouse. The central bank doesn’t care who owes what to whom. All they care about is the net amount. They aren’t “transferring” a balance from bank “A” to bank “B”, they’re just going down the clearinghouse list and creating one transaction for each bank. Every surplus bank is going to receive settlement funds (or *ahem* “reserves”), and every deficit bank is going to lose them. No money is getting transferred. The central bank is simply creating or reducing deposit balances by following the list the clearinghouse provides – one lump sum addition or subtraction to each bank’s balance. The net result is exactly the same as if every bank had sent a courier with cash every time another bank accepted the deposit of one of their checks. It’s just a LOT more efficient.
There's no reason for any bank, under normal clearing, to exchange anything like cash. Now we can see that what we have done is set up a completely different system of money which has very little to do with the bank deposits of all of those bank customers. Settlement funds aren’t being used to protect depositors, or to pay them, or to make loans. We are only keeping score of the net effect of all transactions between banks. What we're really doing here is creating a sort of "mirror" at the central bank of what's going on at our actual banks. It's essentially a complete, duplicate model of our banking system - like one of those WWII strategy boards, where admirals smoking cigars have lackeys push wooden ship models around a plexiglass sea to keep track of the action in the real theater.
Our system of settlements is the plexiglass sea, and reserves are the wooden ships we push around to keep track of which banks are on the attack, and which are hunkering down for a long night of defense.
This is what reserves are. You can't put wooden ship models into battle, nor can banks lend reserves. They exist to aid in score keeping so that we can create and reduce scores as needed to keep track of what's going on without actually having to send couriers to every bank with sacks of checks and cash.