The Monetary Policy Transmission Mechanism and Its Evaluation
The monetary policy transmission mechanism is the chain of linked effects through which a change in Bank Rate, the interest rate set by the Bank of England's Monetary Policy Committee (MPC), eventually changes real output and the rate of inflation.
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Method
- State the direction of the change in Bank Rate (or the start or end of QE) and who sets it: the nine-member MPC, whose primary remit is the 2% CPI inflation target.
- Trace the market rate channel: commercial banks change the interest rates they charge on loans and mortgages and pay on savings, usually in the same direction and close to the same size as the Bank Rate change.
- Trace the asset price channel: a rate rise reduces the present value of shares, bonds and housing, making holders of these assets feel poorer (a negative wealth effect) and less willing to spend.
- Trace the exchange rate channel: higher UK interest rates attract inflows of hot money seeking a better return, raising demand for sterling and appreciating the exchange rate, which makes UK exports dearer abroad and imports cheaper at home.
- Trace the confidence and expectations channel: a rate change signals the MPC's view of future inflation and can shift consumer and business confidence independently of the arithmetic effect on repayments.
- Bring the channels together on an AD/AS diagram: link the fall in each AD component (C, I and X minus M) to a leftward shift of AD, and read off the resulting fall in real output and the price level.
- Evaluate using the standard axes: the time lag before the full effect is felt (the Bank of England itself estimates around one to two years), the size of the effect (larger where more mortgages are variable-rate or due for refixing), the state of the economy (a rate cut is weaker in a liquidity trap or when confidence is very low), the assumption that other things stay constant (a rate change can be offset by fiscal policy or a global demand shock), and unintended consequences (savers gain from a rate rise while borrowers lose, and very low rates for a long period can inflate asset prices).
Worked example
The Bank of England's Monetary Policy Committee raises Bank Rate from 4.5% to 5.25%. A household has an outstanding variable-rate mortgage of 220,000 pounds. Assuming their mortgage rate rises by the same 0.75 percentage points as Bank Rate, calculate the extra amount of interest the household will pay over a full year, then explain, using the transmission mechanism, how this rate rise is intended to reduce inflation.
- Convert the rate rise to a decimal: 0.75 percentage points = 0.0075.
- Multiply this by the mortgage balance: 220,000 x 0.0075 = 1,650.
- State the answer: the household pays 1,650 pounds more interest over the year, money that is no longer available to spend on other goods and services.
- Explain the transmission: higher mortgage costs reduce this household's disposable income, so its consumption (C) falls; the same logic applies to millions of other borrowing households and to firms facing higher borrowing costs for investment (I).
- Link to the exchange rate channel: higher UK interest rates also attract more inflows of foreign capital, appreciating sterling and making UK exports less competitive, so net exports (X minus M) also tend to fall.
- Conclude: the fall in C, I and (X minus M) shifts aggregate demand to the left, which, other things being equal, reduces demand-pull inflationary pressure, consistent with the MPC's inflation target.
Practice questions
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Q1What is Bank Rate?Show answer
Answer: The interest rate set by the Bank of England's Monetary Policy Committee, which commercial banks use as the base for the rates they charge and pay.
Q2Name the two main tools of monetary policy besides changing Bank Rate.Show answer
Answer: Quantitative easing (asset purchases) and forward guidance.
Q3What is the UK's inflation target, and which measure of inflation is it based on?Show answer
Answer: 2%, based on the Consumer Prices Index (CPI).
Q4A saver has 10,000 pounds in an account paying 3% interest. If the rate rises to 3.5%, calculate the extra interest earned in one year.Show answer
Answer: 10,000 x 0.005 = 50 pounds extra.
Q5Explain in one sentence why a rise in Bank Rate tends to appreciate the exchange rate.Show answer
Answer: Higher UK interest rates attract inflows of hot money seeking a better return, raising demand for sterling.
Q6Distinguish between a Bank Rate cut and quantitative easing as tools of monetary policy.Show answer
Answer: A Bank Rate cut lowers the price of borrowing; quantitative easing is the central bank creating new money to buy assets such as government bonds, directly increasing the money supply and bank liquidity.
Q7Give one reason why the effect of a Bank Rate change might be smaller in an economy where most mortgages are fixed-rate.Show answer
Answer: Households on fixed-rate deals do not feel the change in their monthly repayments until their current deal ends, so the transmission mechanism is slower and weaker.
Exam-style questions
Written in the style of a A Level Economics exam paper, with a full mark scheme.
Explain how a cut in Bank Rate could affect the rate of economic growth in the UK.
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Evaluate the extent to which cutting Bank Rate is likely to be effective in raising inflation back towards the 2% target during a period when inflation is below target.
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