Money creation, inflation and interest rates
Money creation, inflation and interest rates: build the core model, apply it to evidence and qualify conclusions where outcomes depend on context.
Section 9.4 · Money and banking
9708 section 9.4; A Level. Checked against Cambridge's 2026–2028 Version 2 (latest version published December 2025) and 2029 Version 1 (published September 2026). Cambridge states that neither version has significant changes affecting teaching. Always follow the syllabus for the candidate's examination year.
Before you begin
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
In liquidity-preference theory, what happens to the interest rate if money supply is fixed and money demand rises?
What you will learn
- Analyse causes of money-supply change in an open economy
- Evaluate policies to reduce inflation
- Apply liquidity preference to demand for money
- Compare loanable-funds and Keynesian interest-rate theories
Core model and terms
Money supply can change through bank credit creation and the bank credit multiplier, central-bank actions, government deficit financing, quantitative easing and balance-of-payments flows. A central bank influences conditions through its policy tools, but transmission depends on bank lending, confidence and demand. Anti-inflation policies may use interest rates, fiscal restraint, supply-side measures or direct interventions; demand reduction can lower inflation pressure but may weaken output and employment, and supply shocks may not respond quickly.
Apply and evaluate
Liquidity preference explains money demand for transactions, precaution and speculation; at a given money supply, higher income can raise transaction demand, while the interest rate is the opportunity cost of holding liquid money. In a loanable-funds model, saving and investment demand interact to determine the real interest rate. In Keynesian theory, money supply and liquidity preference determine the interest rate. State which model is being used and account for expectations, income and policy when comparing predictions.
Pause and explain
Which statement best applies money creation, inflation and interest rates?
Worked example
A central bank buys government securities from the public under quantitative easing. Explain one way this may affect the money supply and one reason the effect on spending could be limited.
Show the worked solution
- The purchase credits deposits and may increase bank reserves
- Lower yields can encourage lending and portfolio spending
- Weak confidence or credit demand can limit the rise in expenditure
Answer The purchase credits deposits and may increase bank reserves → Lower yields can encourage lending and portfolio spending → Weak confidence or credit demand can limit the rise in expenditure
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A central bank buys government securities from the public under quantitative easing. Explain one way this may affect the money supply and one reason the effect on spending could be limited.
Give me a hint
Trace the asset purchase through bank deposits and then consider borrower or lender behaviour.
Compare my reasoning
- The purchase credits deposits and may increase bank reserves
- Lower yields can encourage lending and portfolio spending
- Weak confidence or credit demand can limit the rise in expenditure
The purchase credits deposits and may increase bank reserves Lower yields can encourage lending and portfolio spending Weak confidence or credit demand can limit the rise in expenditure
Look for these in your work
- The purchase credits deposits and may increase bank reserves
- Lower yields can encourage lending and portfolio spending
- Weak confidence or credit demand can limit the rise in expenditure
Income rises while the money supply is unchanged. Explain how transaction demand may affect the interest rate in the liquidity-preference model.
Give me a hint
Trace income into transactions, money demand and the market for money.
Compare my reasoning
- Higher income increases transaction needs
- Money demand rises at the existing rate
- With supply fixed, the interest rate tends to rise to restore equilibrium
Higher income increases transaction needs Money demand rises at the existing rate With supply fixed, the interest rate tends to rise to restore equilibrium
Look for these in your work
- Higher income increases transaction needs
- Money demand rises at the existing rate
- With supply fixed, the interest rate tends to rise to restore equilibrium
A government cuts spending to reduce demand-pull inflation. Explain one likely cost and one condition that affects the outcome.
Give me a hint
Trace aggregate demand first, then name a factor affecting the size of the response.
Compare my reasoning
- Lower spending reduces aggregate demand and price pressure
- Output or employment may also weaken
- The effect depends on spare capacity, timing and the inflation source
Lower spending reduces aggregate demand and price pressure Output or employment may also weaken The effect depends on spare capacity, timing and the inflation source
Look for these in your work
- Lower spending reduces aggregate demand and price pressure
- Output or employment may also weaken
- The effect depends on spare capacity, timing and the inflation source
Why can Keynesian liquidity preference and the loanable-funds model give different explanations of interest-rate determination?
Give me a hint
Compare what each model treats as the market being balanced.
Compare my reasoning
- Loanable funds balances saving with investment demand
- Liquidity-preference theory balances money supply with demand for liquid balances
- The theories emphasise different mechanisms and assumptions
Loanable funds balances saving with investment demand Liquidity-preference theory balances money supply with demand for liquid balances The theories emphasise different mechanisms and assumptions
Look for these in your work
- Loanable funds balances saving with investment demand
- Liquidity-preference theory balances money supply with demand for liquid balances
- The theories emphasise different mechanisms and assumptions
Common mistakes
- Treating central-bank asset purchases as a guaranteed rise in lending or mixing the money-market and loanable-funds mechanisms without stating assumptions.
What can you explain now?
In liquidity-preference theory, what happens to the interest rate if money supply is fixed and money demand rises?
Compare with the explanation
The interest rate tends to rise to reduce excess money demand
A higher rate increases the opportunity cost of holding money and helps restore equilibrium.
After trying it yourself, choose your next review. This is your self-assessment.
Your review choice appears on Today. Sign in to sync it across devices.
Make it stick
Before moving on, explain the central idea in money creation, inflation and interest rates and state one condition that could change its effect.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.