Inflation
The sustained rise in the average price level of goods or services in an economy over a period of time
This causes a fall in the value (purchasing power) of money.
Inflation causes a fall in the value of money. What does this mean?
Deflation
Deflation is a sustained period when the general price level for goods and services is falling.
Disinflation
Disinflation is a fall in the rate of inflation but not sufficient to bring about price deflation. During a period of disinflation, consumer prices are still rising but at a slower rate.
(When the rate of inflation is slowing down – prices are still rising, but at a lower speed.)
Hyperinflation
Hyper-inflation is a phase of extremely rapid inflation nearly always the result of mass money printing by the government with money as an asset ending up as worthless.
What are the two measurements of inflation?
Retail Price Index (RPI)
An older measurement of inflation and is used to calculate the cost of living. However, it is not considered to be an official inflation rate by the government. RPI has largely been replaced by the CPI.
How is RPI calculated?
A survey called the Living Costs and Food Survey is done, including around 6000 households, to find out what people spend their money on. This survey also shows what proportion of income is spent on these items. This is used to work out the relative weighting for each item. | E.g. If 20% of income is spent on transport, then a 20% weighting will be given to transport.
RPI is calculated based on the changes in price of around 700 of the most commonly used goods/services (referred to as the ‘basket of goods’).
These items are chosen based on a living costs and food survey. What is in the basket changes over time, because technology, trends and tastes change – which ensures the basket always reflects what the average household might spend its money on.
The price changes are multiplied by the weighting given to it (based on the proportion of income spent on these items). The price change is then converted to an index number, so inflation is the percentage change of the index number over time. E.g. if the index number rises from 100 to 201, then inflation is 2%.
How is Consumer Price Index (CPI) calculated?
Differences between RPI and CPI
The differences mean that the CPI tends to be lower than the RPI – with the exception of when interest rates are low. However, they both tend to follow the same long-term trend.
The CPI is the official measure of inflation in the UK. Many other countries collect data on inflation in a similar way to CPI so it is often used for international comparisons.
Limitations of RPI and CPI
The RPI and CPI can be really useful, but they also have their limitations:
1) The RPI excludes all households in the top 4% of income. The CPI covers a broader range of the population but doesn’t include mortgage interest payments or council tax.
2) The information given by households in the Living Costs and Food Survey can be inaccurate.
3) The basket of goods only changes once a year – so it might miss out short-term changes in spending habits.
How are CPI and RPI used to measure changes in the UK’s international competitiveness?
How are CPI and RPI used to help to determine wages and state benefits?
Two types of inflation:
Demand-pull inflation
Inflation caused by a rapid growth in aggregate demand
How does demand-pull inflation change the supply/demand curve?
This growth in demand shifts the AD curve to the right (AD to AD1), which allows sellers to raise prices.
Causes of demand-pull inflation
Cost-push inflation
Inflation caused by businesses increasing the prices of their goods and servicesto protect their margins
How does cost-push inflation change the supply/demand curve?
Rising costs of inputs to production force producers to pass on the higher costs to consumers in the form of higher prices, which causes the aggregate supply curve to shift to the left (from AS to AS1).
Causes of cost-push inflation
How can inflation be impacted by changes to the money supply?
If the central bank lowers the base rate, there is likely to be increased borrowing by firms and consumers:
- This will result in an increase in consumption and investment.
- It is likely to lead to a form of demand-pull inflation.
The central bank can also increase the money supply through quantitative easing:
- This will result in increased liquidity and lower interest rates.
- It is likely to lead to a form of demand-pull inflation.
Costs and consequences of inflation
Some potential benefits of inflation
Reduces Real Value of Debt: Inflation can help borrowers repay loans more easily with “cheaper” money.
Encourages Spending and Investment : If people expect prices to rise, they may spend or invest sooner, boosting economic activity.
Wage Growth: In a healthy economy, moderate inflation is often accompanied by rising wages.
Allows for Real Wage Adjustments: Employers can give smaller nominal raises (below inflation), effectively cutting real wages without reducing morale.
Bank of England target for inflation
In the UK, the Bank of England and the government consider low and stable inflation (up to 2%) to be acceptable. Excessive inflation (above 2%) is undesirable and can cause a variety of problems.
The government uses a combination of monetary policy, fiscal policy and supply-side policies to try to keep the rate of inflation at 2%.