Almost all the money you use was created by a commercial bank, mostly by making loans. Not
printed, not minted, not handed on from a saver's pile: typed into existence alongside a
matching debt, and typed back out again when the loan is repaid.
The one thing to remember: loans create deposits. A bank does not wait for
savers and then lend their money onward; it writes a loan and a matching deposit at the same
moment. What limits it is capital, credit risk and the price of money, not the cash in the
vault.
Two models, and what each one is good for
The standard classroom account goes like this. Someone deposits 1,000. The bank must keep ten
percent in reserve and lends 900. That 900 is deposited somewhere, 810 of it is lent on, and so
the process continues until the original deposit has supported ten times its value in money.
This is the "money multiplier", and it is a tidy piece of arithmetic. Its shorter form, a bank
takes deposits in and lends most of them back out, is how nearly every introduction to banking
begins, including our own lesson on how banks work.
That intermediation picture is a fair description of a bank's funding problem. A bank
that lends must find the reserves to settle up when the borrower spends the money, and competing
for deposits is the cheapest way to get them; this is why banks pay interest on savings at all.
What it gets the wrong way round is the sequence. The modern consensus among central
banks, stated plainly by the Bank of England in its own Quarterly Bulletin in 2014, is that
commercial bank lending creates the deposit rather than waiting for one, and that the central
bank does not fix the quantity of reserves and let a multiplier do the rest. Reserves are
supplied in response to demand, at a price the central bank sets. In the United States the
reserve requirement has been zero percent since 26 March 2020, and lending did not become
infinite, which is the simplest possible demonstration that reserves were never the binding
constraint.
So keep what the simpler model gets right (a bank never holds all of what it owes depositors,
which is exactly why a run can break a healthy bank) and drop the direction of causation. The
rest of this page follows the mechanism rather than the teaching story.
The ledger, step by step
Follow a 20,000 car loan through a bank's books. Nothing here is metaphorical: these are the
entries.
A 20,000 loan, from approval to repayment. "Money supply" means broad money: deposits held
by households and firms.
Step
The bank’s books
Your position
Money supply
1. Before the loan
Assets: reserves and existing loans. Liabilities: existing deposits.
Nothing.
Unchanged
2. The loan is approved
Adds a 20,000 loan to assets and a 20,000 deposit to liabilities, in the same keystroke.
You owe 20,000 and hold 20,000.
Up by 20,000
3. You spend it
Reserves leave for the seller’s bank; the loan asset stays.
You own a car and owe 20,000.
Still up by 20,000: the deposit moved, it did not vanish
4. You repay principal
Loan asset shrinks; the deposit used to repay is cancelled.
You owe less.
Down again
5. You pay interest
The deposit you pay with is extinguished and becomes bank income: equity, until the bank spends it on staff, suppliers or dividends.
You are poorer by the interest.
Destroyed on payment, re-created when the bank spends it
Two things fall out of that table. First, the new money is created together with a matching
debt, so the system creates no net wealth by lending. It creates purchasing power now and an
obligation later. Second, repaying a loan destroys money. When households and firms collectively
pay debt down faster than they borrow, the money supply shrinks, which is one reason recessions
are hard to climb out of.
What actually limits the process
The real constraints on bank money creation, roughly in order of how often they bind.
Constraint
What it is
How binding
Capital requirements
A bank must fund a share of its assets with equity that can absorb losses.
Usually the binding one. Basel III capital and leverage ratios, applied nationally.
Liquidity requirements
Enough high-quality liquid assets to survive a 30-day stress run.
Binding in a panic; the SVB failure of 2023 was a liquidity event.
Profitability and credit risk
Loans only get made if the bank expects to be repaid at a price borrowers will accept.
The everyday limit. Demand for sound loans, not vault cash, sets the pace.
Central bank policy rate
The price of the reserves banks use to settle with each other.
Indirect but powerful. It moves the price of every loan in the system.
Reserve requirements
A fraction of deposits held as reserves at the central bank.
Not binding in the United States: the requirement has been zero since 26 March 2020.
Two kinds of money in one economy
It helps to see that there are two separate circuits. Central bank money (physical cash, and
reserve balances that banks hold at the central bank) is used by banks to settle with each
other and by all of us when we use notes. Commercial bank money, your deposit, is a private
promise from your bank to pay you central bank money on demand. When you tap a card, no cash
moves; two banks adjust their claims and settle the net difference in reserves later.
That is why a bank run is not irrational. Your deposit is a promise, and promises can fail. The
ordinary protection is deposit insurance: in the United States, the FDIC covers 250,000 dollars
per depositor, per insured bank, per ownership category. Above that line you are an unsecured
creditor of a private company, which is a sentence worth reading twice if you keep a business
payroll account.
When it breaks: Silicon Valley Bank, March 2023
Silicon Valley Bank had taken in enormous deposits, put a large share into long-dated bonds, and
watched those bonds fall in value as interest rates rose through 2022. Its depositors were
unusually concentrated: venture-backed firms, mostly well above the insurance limit, talking to
each other. When confidence broke, withdrawal requests arrived faster than the bank could sell
assets, and it failed on 10 March 2023. The Federal Reserve's own April 2023 review of its
supervision is the honest primary account and is linked below.
The lesson for a household is narrow and useful. Deposit insurance is real and it worked. Keep
balances inside the limit, spread large balances across institutions or ownership categories,
and do not assume that a bank with a famous name is safer than one with a boring one.
What Scripture assumes about banking
The Bible has no doctrine of monetary aggregates, but it is not innocent of banking. In the
parable of the talents the master's rebuke to the servant who buried the money is that he could
at least have put it with the bankers and collected interest; deposit institutions paying a
return were a normal feature of the world Jesus described.
14“For it is like a man, going into another country, who called his own servants, and entrusted his goods to them. 15To one he gave five talents, to another two, to another one; to each according to his own ability. Then he went on his journey. 16Immediately he who received the five talents went and traded with them, and made another five talents. 17In the same way, he also who got the two gained another two. 18But he who received the one talent went away and dug in the earth, and hid his lord’s money. 19“Now after a long time the lord of those servants came, and reconciled accounts with them. 20He who received the five talents came and brought another five talents, saying, ‘Lord, you delivered to me five talents. Behold, I have gained another five talents besides them.’ 21“His lord said to him, ‘Well done, good and faithful servant. You have been faithful over a few things, I will set you over many things. Enter into the joy of your lord.’ 22“He also who got the two talents came and said, ‘Lord, you delivered to me two talents. Behold, I have gained another two talents besides them.’ 23“His lord said to him, ‘Well done, good and faithful servant. You have been faithful over a few things, I will set you over many things. Enter into the joy of your lord.’ 24“He also who had received the one talent came and said, ‘Lord, I knew you that you are a hard man, reaping where you did not sow, and gathering where you did not scatter. 25I was afraid, and went away and hid your talent in the earth. Behold, you have what is yours.’ 26“But his lord answered him, ‘You wicked and slothful servant. You knew that I reap where I didn’t sow, and gather where I didn’t scatter. 27You ought therefore to have deposited my money with the bankers, and at my coming I should have received back my own with interest. 28Take away therefore the talent from him, and give it to him who has the ten talents. 29For to everyone who has will be given, and he will have abundance, but from him who doesn’t have, even that which he has will be taken away. 30Throw out the unprofitable servant into the outer darkness, where there will be weeping and gnashing of teeth.’
Note what the master expects: not a scheme, but ordinary productive use. Depositing with bankers is named as the minimum acceptable option, which tells you deposit banking was unremarkable in the first century. The parable is about faithfulness with what belongs to someone else; it is not investment advice, and the third servant is not condemned for a bad return but for doing nothing.
Scripture also assumes the other side of the ledger. Israel's law regulated lending in detail,
protected the pledged cloak of a poor borrower, and released debts in the seventh year, a
covenant civil code, not a church rule, but one that shows God treating credit as a place where
people get hurt. That is the subject of
interest and usury.
Weighed by the Book
CommandedWhat Scripture commands
Pay what you owe, to whom it is owed, when it is due (Romans 13:7-8). Psalm 37:21 names failing to repay as the mark of the wicked.
Deal honestly in a business whose whole product is a promise (Proverbs 11:1; Leviticus 19:35-36).
Do not use a poor neighbour’s need as leverage in the terms of a loan (Exodus 22:25).
WisdomWise application, not command
Know where your money is and whose promise it is. Deposit insurance limits are worth checking once a year.
What is prudent for one household can be awkward for the whole: repayment destroys money, so when everyone deleverages at once the money supply shrinks. That is an argument about policy, not about you: your obligation is to your own household first (1 Timothy 5:8).
Borrowing is regulated in Scripture, never commended. That is a reason for caution, not a prohibition.
FreedomWhere faithful people differ
Whether fractional-reserve banking is a just arrangement is an economic and political judgement. Christians hold every position on it, and no verse settles it.
Choosing a bank, a credit union, or a mix of both is a matter of prudence and preference.
Lesson: how banks work: the practical version, with what to look for in an account. It uses the simpler intermediation picture described above; this page has the mechanism underneath it.