How Do Banks Create Money and Central Banks Influence Lending?
Monetary policy
What you will learn
- A commercial-bank loan creates a matching deposit, but capital, liquidity, risk and credit demand limit lending.
- Apply the model to an original scenario and justify its limits.
Essential definitions
- Bank deposit money
- Balances in bank accounts that can be used to make payments.
- Open-market operation
- A central-bank purchase or sale of financial securities.
- Reserve requirement
- A minimum reserve holding specified relative to eligible bank liabilities.
Follow a new loan
When a commercial bank grants a 5,000-unit loan, it records an asset: the borrower's obligation to repay. It also credits a deposit of 5,000, a liability because the bank owes the customer that balance. The customer can spend the deposit. Lending has created deposit money rather than merely handing over a fixed pile of existing savings.
Repaying principal reverses the process, reducing the loan and deposits. Interest is payment for the loan and becomes bank income; it is different from repayment of principal. When deposits move to another bank, banks need settlement funds, so creating a deposit does not remove their payment obligations.
Why lending is limited
Banks need capital to absorb losses, liquidity to settle payments and creditworthy customers willing to borrow. Regulation, expected profits and risk constrain them. More reserves, the balances used for settlement, do not force a bank to approve an unsafe loan or persuade a household to take it.
A reserve-ratio model can illustrate one constraint under strong assumptions. It should not be treated as a mechanical forecast of credit growth. Diagnose whether the obstacle is funding, insufficient capital, poor borrower prospects or weak spending demand before choosing a policy tool.
Connect monetary tools to incentives
In the simplified model, central-bank purchases of securities add liquidity and can lower interest rates; sales remove liquidity and can raise them. A lower policy or discount rate changes short-term funding conditions. A lower reserve requirement, where used, relaxes one balance-sheet constraint. In each case, explain why banks or borrowers might change their choices.
Quantitative easing means large-scale asset purchases aimed at broader financing conditions, often when short-term rate cuts are limited. Purchases can raise bond prices and lower yields, making finance cheaper. Yet frightened households may repay debt and firms may see no profitable project. Easier bank conditions must translate into actual spending before output is affected.
Hypothetical worked application
- A hypothetical bank lends 5,000 units and credits the borrower’s account by 5,000.
- Assets rise by a 5,000-unit loan and liabilities rise by a 5,000-unit deposit.
- Repaying 1,000 of principal reduces the outstanding loan and the corresponding deposit money by 1,000.
Loan creation expands a bank balance sheet; principal repayment contracts it.
Apply and evaluate
- Liquidity support is less effective when banks lack capital or borrowers lack profitable projects.
Common misconceptions
- New reserves do not mechanically force lending; capital, risk and credit demand constrain expansion.
Knowledge check
What matching entries arise when a bank makes a new loan?
Real-world application
Monetary easing during the pandemic
15 March 2020: The US Federal Reserve lowered the federal funds target range to 0–0.25% in its emergency policy announcement.
Model application: lower rates can support consumption and investment by reducing financing costs. Near-zero rates also illustrate the limited room for conventional further cuts. Restrictions on production and low confidence can weaken the spending response, so a rate cut is not a guarantee of an immediate recovery.
Federal Reserve, FOMC statement ↗Historical evidence checked 9 October 2026. The model interpretation is an original teaching application.
Loans create deposits
14 March 2014: The Bank of England explains that commercial-bank lending creates matching deposits and that banks do not mechanically multiply a fixed stock of central-bank money into loans.
Use a balance sheet: the bank gains a loan asset and a deposit liability. The borrower gains a deposit and a debt, not free net wealth. Profitability, credit risk, capital, liquidity and monetary policy constrain the process. The simple reserve-ratio story is a conditional model, not a universal description of banking.
Bank of England, Money creation in the modern economy ↗Historical evidence checked 9 October 2026. The model interpretation is an original teaching application.
What to remember
A commercial-bank loan creates a matching deposit, but capital, liquidity, risk and credit demand limit lending. Central-bank tools influence those conditions rather than guaranteeing extra borrowing.
Completion is your own reflection on learning, not a test score. Syllabus references: 3.5.03, 3.5.04.
Sources and applications
Lessons in this section
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