Why did the Bank of England raise interest rates to 4%? The economics explained

Short answer: On 5 November 2026 the Bank of England raised Bank Rate from 3.75% to 4%, because UK inflation had climbed to 3.5% and global energy prices were still rising. Higher interest rates make borrowing more expensive and saving more rewarding, which slows spending and reduces the pressure on prices. In economics terms, this is a monetary policy response to cost-push inflation. [1][3]

What actually happened

The Monetary Policy Committee (MPC) is the group of nine experts at the Bank of England who set the interest rate. Its vote on 4 November, published on 5 November, was 8 to 1 to raise Bank Rate by 0.25 percentage points, to 4%. One member voted for a bigger rise of 0.5 points. [1]

The reason is inflation, which means the general rate at which prices rise. The Bank's target is 2%. The Office for National Statistics (ONS) reported that the Consumer Prices Index (CPI) rose by 3.5% in the 12 months to September 2026, up from 3.1% in August. [3] The Bank says global energy prices have kept rising during the conflict in the Middle East, and that the prices of fuels were a main reason for the rise in inflation in September. It also records that Brent crude oil futures averaged $108 a barrel over the 15 working days to 27 October. [1]

You can see this in everyday life. The ONS says transport, especially motor fuels, was the biggest upward contribution to the change in inflation. Motor fuel prices were 29.8% higher than a year earlier, with petrol averaging 169.5 pence a litre. [3]

The theory: two kinds of inflation

Economists separate inflation by its cause. Demand-pull inflation happens when total spending in the economy grows faster than the economy can supply, so firms raise prices. Cost-push inflation happens when firms' costs rise, for example because oil or gas becomes more expensive, so they pass the cost on to customers. On an aggregate demand and aggregate supply diagram, cost-push is a leftward shift of short-run aggregate supply (SRAS), which raises the price level and lowers real output.

This episode looks mainly cost-push. That makes the decision interesting. A higher interest rate reduces demand, but it does not make oil cheaper. So why do it?

Why raise rates against a cost shock?

The Bank's argument is about what happens next. It says there is still limited evidence of knock-on effects on other prices and wages, but that pressure in the pipeline is now enough to justify a rise. [1] The fear is a second-round effect: workers see living costs rise, ask for higher pay, firms raise prices again, and inflation becomes self-sustaining. Raising rates early is meant to keep expectations of future inflation anchored near 2%.

The mechanism, called the transmission mechanism, runs like this:

• Bank Rate rises, so banks raise the rates they charge on loans and mortgages.
• Households with variable-rate debt pay more, and saving becomes more attractive, so consumption falls.
• Firms find borrowing for investment more expensive, so investment falls.
• A higher interest rate can raise the value of the pound, which lowers the price of imports.
• Aggregate demand grows more slowly, which reduces upward pressure on prices.

CC illustrative data: a household has an interest-only variable-rate mortgage of £200,000. A rise of 0.25 percentage points adds £200,000 × 0.0025 = £500 a year, or about £42 a month. That is the real-life shape of the policy: a small monthly squeeze, multiplied across millions of households.

The evaluation: could it backfire?

This is where marks are won. Good evaluation weighs the policy, it does not just list its problems.

• Wrong tool for the cause: interest rates cannot reduce global oil or gas prices. They only reduce demand, so the economy may bear the pain of slower growth without the cost shock easing.
• Time lags: the effects of a rate rise build up slowly, so the shock may have passed before the policy bites.
• Trade-off: the Bank itself reports that activity has been stronger than expected, which gives it less reason to worry about weak demand. [1] But if growth weakens, the cost is lost output and jobs.
• Uncertainty: the Bank expects inflation to rise to around 5% by the middle of 2027 before it falls back towards 2%. [2] So the rise may be only the start of a longer period of high rates.

How this links to your exam

This topic sits in the macroeconomics content of both main A-level specifications. On AQA A-level Economics (7136) the relevant headings are "Inflation and deflation" (which covers demand-pull and cost-push influences) and "Central banks and monetary policy" (which covers how Bank Rate is used and the transmission mechanism). [4] On Pearson Edexcel A-level Economics A (9EC0) it sits in Theme 2, under "Inflation" and "Demand-side policies". [5]

AQA's published weightings reward more than knowledge: roughly 26 to 29% of marks are for application (AO2), 26 to 29% for analysis (AO3) and 22 to 25% for evaluation (AO4). [6] A real event like this one gives you material for all three. Use it like this:

• AO2 (application): quote a real figure, such as CPI of 3.5% or Bank Rate of 4%, so your answer is clearly about a real economy.
• AO3 (analysis): build the chain of reasoning: higher rate, higher borrowing cost, lower consumption and investment, lower aggregate demand, lower inflation pressure.
• AO4 (evaluation): judge. Say which factor matters most and why, for example whether the cause of inflation is cost-push, which limits what interest rates can achieve.

Questions on this topic may ask you to explain, analyse, assess or evaluate a monetary policy decision. An "assess" or "evaluate" question needs a judgement; an "explain" question does not.

CC practice question: Assess whether a rise in Bank Rate is an effective response to cost-push inflation caused by higher energy prices.

CC worked paragraph: A rise in Bank Rate is only partly effective against cost-push inflation. It lowers aggregate demand, because households with variable-rate mortgages have less to spend and firms postpone investment, so firms find it harder to raise prices without losing sales. This matters if higher energy prices start to feed into wage demands, because the policy then anchors expectations before a wage-price spiral forms. However, the original cause is a leftward shift in SRAS caused by global energy prices, which the Bank cannot change. Slower demand therefore treats the symptom and may lower output and employment. Overall, the policy is most effective if the shock is short-lived and expectations are the real danger; it is least effective if energy prices stay high for years, because the cost in lost output then outweighs the benefit.

How CC approaches this

The Criterion Method starts from what examiners reward. In an essay like the one above, that is a clear chain of analysis, a real-world anchor, and a judgement that answers the question. Students also learn differently: the Academic DNA diagnostic helps show whether you do best with diagrams, worked examples or discussion. If you study Economics, the CC Economics topic library maps every AQA 7136 specification point to the Edexcel A and Pearson IAL equivalents, and the Inner Academy goes deeper on current-events analysis.