ECON30005 · Money and Banking
Money Creation Through Banking
Week 5 shows how banks create money. The bank balance-sheet identity (assets = liabilities + capital) and asset transformation set the stage; then making a loan simultaneously creates a matching deposit, so the money supply rises. The chapter contrasts the modern view (lending is not constrained by reserves; reserves adjust) with the textbook money-multiplier appendix, where deposit expansion equals the injection times 1/(required reserve ratio). Expect true/false on 'loans create deposits' and a money-multiplier calculation.
What this chapter covers
- 01The bank balance-sheet identity: total assets = total liabilities + bank capital
- 02Assets (reserves, securities, loans) and liabilities (deposits, borrowings, capital) — loans are the largest asset
- 03Asset transformation: banks borrow short and lend long, transforming maturity, liquidity, risk and size
- 04Loans create deposits: a new loan simultaneously credits a matching deposit, raising the money supply
- 05Interbank settlement: paying another bank moves reserves, but the deposit stays in the system and money stays elevated
- 06The modern view: lending is not reserve-constrained; reserves adjust, and many economies have no reserve requirement
- 07The textbook money multiplier appendix: maximum deposit expansion = injection × 1/(required reserve ratio)
- 08What actually constrains money creation: credit demand, banks' risk/liquidity management, capital requirements and monetary policy
Loans create deposits, then the textbook money multiplier
- +1(a) Loans create deposits: crediting the borrower's account creates a new $500 deposit at the same time as the $500 loan asset, so the money supply rises by $500 immediately — the bank's assets and liabilities both grow by $500.
- +1If the borrower pays someone at another bank, the lending bank transfers $500 of reserves to the receiving bank, but the deposit simply moves banks — it stays inside the banking system, so the money supply remains $500 higher. Reserves shift; money does not disappear.
- +1(b) Textbook multiplier: with required-reserve ratio rr = 0.08 and no leakages, deposits expand as a geometric series, giving the simple deposit multiplier 1/rr = 1/0.08 = 12.5. Maximum deposit expansion = injection × multiplier = 250 × 12.5 = $3,125.
- +1Why it is only a ceiling: the multiplier assumes banks hold no excess reserves and the public holds no extra cash, and it treats reserves as the binding constraint. In practice lending is not reserve-constrained — reserves follow lending, and many economies (including Australia) have no reserve requirement — so credit demand, bank capital and regulation are what actually limit money creation.
Key terms
- Bank balance-sheet identity
- Total assets = total liabilities + bank capital. Assets are uses of funds (reserves, securities, loans); liabilities are sources (deposits, borrowings); capital is the owners' cushion against asset-value declines.
- Asset transformation
- The bank practice of 'borrowing short and lending long', converting short-term, liquid, safe, small deposits into long-term, illiquid, risky, large loans — transforming maturity, liquidity, risk and size.
- Loans create deposits
- The modern description of money creation: when a bank makes a loan it simultaneously credits a matching deposit, so the money supply rises by the loan amount. Lending is not first funded by reserves; reserves adjust afterward.
- Money multiplier
- In the textbook appendix, the maximum ratio of deposit expansion to an injection of reserves, equal to 1/(required reserve ratio) when banks hold no excess reserves and the public holds no extra cash. A ceiling, not a mechanism.
- Monetary base
- Currency in circulation plus bank reserves — the quantity a central bank controls directly. An open-market purchase raises the base; in the textbook model this can support a multiple expansion of deposits.
- Required-reserve ratio
- The fraction of deposits a bank must hold as reserves. It sets the textbook multiplier 1/rr, but many economies (including Australia and the US since 2020) have set it to zero, which is why the multiplier is not how money is really created.
Money Creation Through Banking FAQ
How can banks 'create' money just by lending?
When a bank approves a loan it does not hand over someone else's cash; it credits the borrower's deposit account, creating a new deposit and a matching loan asset at the same instant. Since deposits are money, the money supply rises by the loan amount. If the borrower spends the money at another bank, reserves move between banks but the deposit stays in the system, so the money stays created. This 'loans create deposits' view is how modern money creation actually works.
If banks create money by lending, why learn the money multiplier?
The money multiplier 1/(required reserve ratio) is the traditional textbook account and is still examinable, but it describes a maximum under strong assumptions (no excess reserves, no cash drain) and treats reserves as the binding constraint. The modern view is that reserves follow lending, not the other way round, and many economies have no reserve requirement at all. Learn the multiplier as a ceiling and be ready to state why it is not the mechanism.
What really limits how much money banks create?
Not reserves. The actual constraints are the demand for credit (especially via the interest rate the central bank sets), banks' own liquidity and risk management and profit incentives, and capital requirements and regulation. The ultimate lever is monetary policy: by setting the policy rate the central bank influences lending and funding costs, and hence how much new money bank lending creates.
Can AI help me with money creation in ECON30005?
Yes. Sia can walk you through the loan-creates-deposit balance-sheet steps, compute a money multiplier on fresh numbers, and explain the contrast between the textbook and modern views. Use it to rehearse the mechanics and check your working; it does not complete graded quizzes for you, and you should confirm assessment rules on Canvas.
Exam move
Get fluent moving between the two accounts of money creation. Practise the balance-sheet walk-through: a new loan creates a matching deposit (money up by the loan), and an interbank payment moves reserves while the deposit stays in the system (money unchanged). Then drill the money multiplier 1/rr on fresh reserve injections, and always append the caveat that it is a ceiling and that reserves follow lending. Keep the bank balance-sheet identity and the four dimensions of asset transformation (maturity, liquidity, risk, size) as one-line recalls for the true/false section. A favourite trap is claiming banks 'lend out reserves' — be ready to correct it. This week pairs directly with banking risk and regulation, so link the created deposits to the risks the transformation creates. Confirm the assessment structure on Canvas.
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