Inflation affects almost every part of the economy — from food prices and wages to pensions, mortgages, and central bank policy. But how is inflation actually calculated?

In this episode, Skip Montreux and Dez Morgan look at the Consumer Price Index, or CPI, and explain how governments measure changes in the cost of goods and services over time.

They start by explaining CPI, one of the main figures used to measure inflation. Dez explains how the Office for National Statistics in the UK tracks the price of a representative basket of goods and services. This basket includes many things people commonly buy, such as groceries, clothes, transport, household items, and services.

Skip and Dez then discuss how this basket changes over time. The items are updated every year to reflect changes in consumer habits and lifestyles. This year, items such as hummus, alcohol-free beer, pet grooming services, and motorhomes were added to the UK basket, while premium lager bought in a pub was removed.

Next, they look at why accurate inflation data is so important. CPI can influence pension increases, wage negotiations, and central bank decisions. If inflation is above a target level, a central bank may raise interest rates, which can affect mortgages, credit cards, and economic growth.

Finally, Skip and Dez discuss some of the more complicated methods used in inflation calculations. These include substitution, Chained CPI, Owner’s Equivalent Rent, and hedonic adjustments. These methods can be controversial because they raise an important question: should inflation measure only what people spend, or should it also consider changes in product quality?

This episode helps listeners understand how inflation is calculated while building practical Business English skills. In this episode, you will learn:

How CPI is used to measure inflation.
What a representative basket of goods and services means.
Why the CPI basket changes as consumer habits change.
How CPI can affect pensions, wages, interest rates, and central bank policy.
What substitution, Chained CPI, Owner’s Equivalent Rent, and hedonic adjustments mean.
Why some people are skeptical of how inflation is measured.

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Contact Skip, Dez, and Samantha at

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Calculating Inflation

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Calculating Inflation