AQA A-Level Economics (7136)

## Learning Outcomes

- Define **inflation**, **deflation** and **disinflation** accurately
- Explain how inflation is measured using **CPI** and **RPI**
- Distinguish between **demand-pull inflation** and **cost-push inflation** using AD/AS analysis
- Calculate an inflation rate from index number data
- Analyse the effects of inflation and deflation on households, firms and the wider economy
- Evaluate when inflation or deflation is most harmful, using short-run and long-run reasoning
- Apply UK policy context, including the **Bank of England’s 2% CPI target**

## AQA A-Level Economics (7136) Syllabus

For the AQA A-Level Economics (7136), you are expected to understand inflation and deflation as key indicators of macroeconomic performance, with a focus on the following syllabus points:

- Know that **inflation** is a sustained rise in the general price level and **deflation** is a sustained fall in the general price level
- Explain the difference between **deflation** and **disinflation**
- Understand how inflation is measured using **price indices**, especially **CPI** and **RPI**
- Identify the causes of **demand-pull inflation** and **cost-push inflation**
- Use **AD/AS analysis** to explain inflationary and deflationary pressures
- Understand how **world commodity prices**, exchange rates and supply shocks can affect UK inflation
- Analyse the effects of inflation and deflation on living standards, competitiveness, investment and employment
- Apply the UK policy context of the **2% CPI inflation target**

## Test Your Knowledge

_Attempt these questions before reading this article. If you find some difficult or cannot remember the answers, look more closely at that area during your revision._

1. What is the difference between inflation, deflation and disinflation?
2. How is the inflation rate calculated from CPI data?
3. What causes demand-pull inflation, and how is it shown on an AD/AS diagram?
4. Why can cost-push inflation create a policy problem for governments?
5. Why is deflation usually seen as more dangerous than low positive inflation?

## Introduction

Inflation and deflation matter because they affect almost every macroeconomic objective. Changes in the general price level influence real incomes, saving, investment, competitiveness, employment and growth. In AQA Economics, this topic often appears in essays and data response questions because it links directly to AD/AS analysis, policy trade-offs and real UK events.

For exams, you need more than simple definitions. You must explain how inflation is measured, why it happens, and why its effects depend on whether it is low or high, expected or unexpected, and caused by demand or supply factors.

> **Key Term: inflation**
> A sustained rise in the general price level over time, causing the purchasing power of money to fall.

### Measuring inflation and making key distinctions

Inflation is a **rate of change**. This means economists are not just asking whether prices are high, but whether the average level of prices is rising over time.

The UK mainly uses the **Consumer Prices Index (CPI)** for the inflation target. CPI measures the average change in prices of a weighted basket of goods and services bought by households. Different items are given different weights because households spend more on some items than others.

> **Key Term: Consumer Prices Index (CPI)**
> The main UK measure used for the inflation target, showing the average change in prices of a weighted basket of consumer goods and services.

The basic inflation-rate formula is:

$$
\text{Inflation rate} = \frac{\text{CPI this year} - \text{CPI last year}}{\text{CPI last year}} \times 100
$$

Worked example:

Suppose CPI last year was **120** and this year it is **126**.

Step 1: Find the change in the index

$$
126 - 120 = 6
$$

Step 2: Divide by last year's index

$$
\frac{6}{120} = 0.05
$$

Step 3: Multiply by 100

$$
0.05 \times 100 = 5
$$

So the inflation rate is **5%**.

A very common exam error is confusing the **price level** with the **inflation rate**. If inflation falls from 8% to 4%, prices are still rising. They are just rising more slowly.

> **Key Term: disinflation**
> A fall in the rate of inflation, where prices are still rising but at a slower rate.
>
> **Key Term: deflation**
> A sustained fall in the general price level over time, causing the purchasing power of money to rise.

You should also know the difference between **CPI**, **CPIH** and **RPI**. For the specification, CPI and RPI are the core measures. CPI is used for the Bank of England’s inflation target. RPI is an older measure and tends to be higher because of differences in coverage, housing treatment and calculation method. CPIH is now the ONS lead measure and includes owner occupiers’ housing costs and Council Tax, but the key policy target remains CPI.

> **Test Tip:** Examiners often reward precise distinctions. If the question asks about falling inflation, do not write about deflation unless the inflation rate has fallen below 0%.

### Causes of inflation: demand-pull and cost-push

Inflation is usually explained through **aggregate demand** and **short-run aggregate supply**.

> **Key Term: demand-pull inflation**
> Inflation caused by an increase in aggregate demand, shown by a rightward shift of the AD curve.

Demand-pull inflation happens when total spending in the economy rises faster than the economy can produce output. In AD/AS terms, AD shifts right. This may be caused by:

- higher consumer spending
- lower interest rates
- higher government spending
- tax cuts
- rising investment
- stronger exports

If the economy has spare capacity, a rise in AD may increase real output a lot and the price level only a little. But if the economy is close to full capacity, the same increase in AD is more likely to create inflation rather than real growth.

This is a strong evaluation point. The size of the inflation effect depends on the position of the economy on the SRAS curve.

> **Key Term: cost-push inflation**
> Inflation caused by rising production costs, shown by a leftward shift of the SRAS curve.

Cost-push inflation happens when firms face higher costs and pass these on through higher prices. Causes include:

- rising wages not matched by productivity
- higher oil, gas and electricity prices
- higher prices of imported raw materials
- depreciation of the exchange rate
- higher indirect taxes
- supply-chain disruption

This kind of inflation is especially difficult for policymakers because it may come with lower output and higher unemployment. A leftward shift in SRAS raises the price level but reduces real national output. That is why cost-push inflation can create **stagflation**.

Imported inflation is a form of cost-push inflation. For example, if world energy prices rise sharply, UK firms face higher production and transport costs. If sterling depreciates, imported goods and components also become more expensive.

A brief monetarist point can also help. Monetarists argue that persistent inflation is linked to excessive growth of the money supply relative to real output. In exam answers, this works best as an extra layer of analysis rather than a replacement for AD/AS.

> **Test Tip:** For 15- or 25-mark questions on causes of inflation, structure your answer by separating demand-pull and cost-push clearly. Then evaluate by asking which is more significant in the specific context given.

### Effects of inflation and deflation

The effects of inflation depend on the rate and the stability of inflation.

Low and stable inflation is usually less harmful than high and unstable inflation. A small positive rate can help the economy because it reduces the risk of deflation and allows real wages to adjust without firms having to cut money wages directly.

However, high or unpredictable inflation creates several problems.

First, it can reduce **real incomes** if wages or benefits do not keep up with prices. This hurts households on fixed incomes most.

Second, inflation creates **redistribution effects**. Borrowers may gain because the real value of debt falls. Lenders and savers may lose if interest earned is lower than inflation.

Third, inflation can reduce international competitiveness if UK prices rise faster than those in competitor countries. Exports become relatively more expensive and imports relatively cheaper, which may worsen the current account.

Fourth, inflation creates uncertainty. Firms may delay investment because future costs and prices are harder to predict. This can reduce long-run growth.

Fifth, inflation creates **menu costs** and **shoe leather costs**.

> **Key Term: menu costs**
> The costs to firms of changing prices, such as updating labels, catalogues and systems.
>
> **Key Term: shoe leather costs**
> The time and effort spent by consumers and firms dealing with changing prices and reducing cash holdings.

Now turn to deflation. Students sometimes assume falling prices must be good. In reality, persistent deflation is usually damaging.

If households expect prices to keep falling, they may delay spending, especially on durable goods such as cars, furniture and electronics. This reduces AD further. Firms then face lower revenue and profits, so they may cut investment and jobs. Unemployment rises, incomes fall, and spending weakens again. This can create a **deflationary spiral**.

Deflation also increases the **real burden of debt**. If wages and prices are falling, existing debts become harder to repay. This puts pressure on households, firms and banks.

There is, however, an important evaluation point. Not all deflation is equally harmful. If prices fall because productivity improves and SRAS shifts right, output may rise while prices fall. This is sometimes called **benign deflation**. By contrast, deflation caused by collapsing AD is usually **malign** because it comes with recession and unemployment.

So, when evaluating deflation, always ask: is it being caused by weak demand or stronger supply?

### UK policy context and how to structure an evaluative answer

The UK government sets the **Bank of England** a **2% CPI inflation target**. This target is symmetric, meaning inflation above 2% and below 2% are both undesirable. The Monetary Policy Committee aims to return inflation to target over the medium term rather than immediately after every shock.

This matters for evaluation. Suppose inflation is above target because of a temporary rise in global energy prices. Raising interest rates aggressively may reduce AD, but it could also weaken growth and increase unemployment. So policymakers may accept above-target inflation for a period if the alternative is a deep slowdown.

You should also recognise that controlling inflation can conflict with other macroeconomic objectives. Tight monetary or fiscal policy may reduce inflation, but it can also reduce growth and employment in the short run.

For essay questions, a strong judgement usually includes:

- the **type** of inflation involved
- whether the economy has **spare capacity**
- whether the inflation is **temporary or persistent**
- whether inflation is **expected or unexpected**
- the impact on different groups such as households, firms, borrowers, savers and exporters
- the short-run versus long-run effects

How to structure an evaluative answer:

Start with a clear definition and one main analytical chain. Then add a second cause or effect. After that, evaluate using “on the one hand / on the other hand / it depends on”. For example, on the one hand inflation damages competitiveness and real incomes; on the other hand low stable inflation may be less harmful than deflation. Then decide what changes the answer: the source of inflation, the size of the inflation rate, the state of the economy, and how quickly policy responds.

Common student errors in this topic include:

- confusing **deflation** with **disinflation**
- saying “falling inflation means falling prices”
- forgetting that **CPI**, not RPI, is the Bank of England target measure
- describing AD/AS shifts without explaining the effect on both **price level** and **real output**
- giving generic evaluation without linking it to the cause of inflation

## Key Point Checklist

_This article has covered the following key knowledge points:_

- Inflation is a sustained rise in the general price level
- Deflation is a sustained fall in the general price level
- Disinflation means the inflation rate is falling but still positive
- CPI is the UK inflation-target measure used by the Bank of England
- RPI is an older legacy measure and often gives a higher inflation reading than CPI
- Inflation can be calculated using the percentage change in a price index
- Demand-pull inflation is caused by a rightward shift in AD
- Cost-push inflation is caused by a leftward shift in SRAS
- The effects of inflation depend on whether it is low or high, stable or unstable, expected or unexpected
- Inflation can reduce real incomes, create uncertainty and worsen competitiveness
- Deflation is usually harmful when caused by weak AD because it can create a deflationary spiral
- A fall in inflation does not mean prices are falling unless the inflation rate is below 0%

## Key Terms and Concepts

- inflation
- Consumer Prices Index (CPI)
- disinflation
- deflation
- demand-pull inflation
- cost-push inflation
- menu costs
- shoe leather costs


Macroeconomic Performance - Inflation and deflation