... like I'm 5 years old
Most money is not created by printing banknotes. It appears when commercial banks make loans. If a bank approves a $20,000 car loan, it usually does not move $20,000 of existing cash from another customer’s account. Instead, it adds a $20,000 deposit to the borrower’s account. The borrower now has spendable money, while the bank records a $20,000 loan that must be repaid.
Two matching records have appeared. The deposit is money the bank owes its customer, so it is a liability for the bank. The loan is money the customer owes the bank, so it is an asset for the bank. This expansion of the bank’s balance sheet creates new deposit money, as explained in the Bank of England’s guide to money creation.
The process works in reverse when the borrower repays the loan’s principal. Money leaves the borrower’s account, and the outstanding loan falls by the same amount. The deposit money used for that repayment effectively disappears. Interest payments work differently: they become income for the bank rather than canceling the original loan principal.
Banks cannot create unlimited money. They need trustworthy borrowers, sufficient capital to absorb losses and enough liquid resources to complete payments. Regulation, competition, interest rates and the risk of borrowers defaulting all limit lending.
Banks therefore create money, but they do not create free wealth. The borrower gains money and an equally large debt. Real wealth grows only if the loan helps produce something valuable, such as a home, factory, education or successful business.
Think of a bank loan as writing a new store voucher and an equally large IOU at the same moment. The voucher can be spent, but the IOU must eventually be repaid.
... like I'm in College
Imagine Maria receives a $300,000 mortgage from Bank A and uses it to buy David’s house. When the mortgage is approved, Bank A records a $300,000 loan as an asset and creates a $300,000 deposit as its liability. The banking system now contains more deposit money than it did before the loan.
Maria sends the money to David. If David uses Bank B, Bank A must settle the payment by transferring central bank reserves to Bank B. Reserves are a separate form of electronic money used mainly among banks and the central bank. The public generally spends commercial bank deposits, while banks use reserves to settle obligations between themselves.
This distinction explains why a bank can create a deposit without first locating an equal deposit from a saver, yet still needs stable funding and liquidity afterward. If newly created deposits repeatedly move to other institutions, the lending bank loses reserves and may need to attract deposits, borrow from another bank, sell assets or obtain central bank funding. The Deutsche Bundesbank’s explanation of book-money creation describes this interaction between lending and subsequent settlement.
Banks also face capital requirements. Capital is primarily the owners’ stake and retained earnings available to absorb losses. If too many borrowers default, capital falls. A bank with inadequate capital cannot safely continue expanding its balance sheet.
The central bank influences this process rather than approving every individual loan. By changing policy rates, it affects banks’ costs, loan prices and customers’ willingness to borrow. Understanding how interest rates affect the economy therefore helps explain why money creation tends to accelerate or slow over the economic cycle.
Picture a Lego city containing two builders, Maria and Bank A. Maria wants 100 blue bricks to construct a workshop, but she does not have them. Bank A opens its ledger and creates two matching Lego pieces: a box labeled “100 bricks available to Maria” and a card labeled “Maria owes Bank A 100 bricks.”
The box represents Maria’s deposit. She can transfer its bricks to other people, so the city accepts them as money. The card represents the bank’s loan asset. Bank A has created spendable bricks, but it has also created a matching debt. The city has more money-like bricks, not 100 bricks of unearned wealth.
Maria buys a workshop from David, who uses Bank B. Bank A must now send special red settlement bricks to Bank B. These red pieces represent central bank reserves. Ordinary residents rarely use them, but banks exchange them when customers make payments across institutions.
Bank A cannot keep creating blue boxes forever. The Lego banking supervisor requires it to maintain sturdy foundation pieces representing capital. It also needs enough red settlement bricks, dependable funding and borrowers likely to repay. The central bank can make lending faster or slower by changing the cost of obtaining financial resources, one part of the wider role played by central banks.
As Maria repays the principal, Bank A removes bricks from her deposit box and reduces the number written on her debt card. Once the final principal payment is made, both the created deposit and the loan are gone.
The workshop remains. If Maria used it productively, the temporary financial bricks helped the city build lasting real value.
... like I'm an expert
Commercial bank money creation is an endogenous balance-sheet operation. When a bank originates a loan to a non-bank borrower, it debits a loan-asset account and credits a deposit-liability account. Broad money rises because the non-bank private sector has acquired an additional transferable deposit. No prior reserve transfer is required at origination, although liquidity management, funding costs and settlement obligations subsequently matter.
The textbook deposit-multiplier narrative—reserves arrive first and are mechanically multiplied through repeated lending—is therefore an unreliable description of modern operational sequencing. Banks generally lend when expected risk-adjusted returns justify doing so, subject to capital, liquidity, leverage, underwriting and regulatory constraints. They then manage the resulting reserve and funding positions. Central banks ordinarily accommodate system-wide demand for settlement balances at the policy rate needed to maintain interest-rate control.
When the deposit is transferred to another bank, reserves move between institutions, but aggregate reserves do not necessarily change. The originating bank experiences a liquidity outflow; the receiving bank gains reserves and a deposit liability. The distribution of reserves changes even though the quantity of deposit money created through the original loan remains unchanged.
Loan-principal repayment contracts both sides of the bank’s balance sheet and destroys deposits. Bank purchases of assets from non-banks can also create deposits, while asset sales to non-banks can destroy them. Central bank asset purchases have different effects depending on the seller: purchasing from a non-bank can create both reserves and commercial bank deposits, whereas purchasing directly from a bank mainly exchanges one bank asset for another. The Federal Reserve discusses these mechanisms in its analysis of bank deposit creation and asset purchases.
The quantity of money is consequently shaped by interacting credit demand, bank risk appetite, borrower creditworthiness, regulation, asset transactions and monetary policy. The broader consequences depend on where new purchasing power flows, including whether it finances production, consumption or existing assets.