What Is Compound Interest? The Idea Behind Long-Term Investing
May 5, 2026
7 min read
What Is Inflation — And What Does It Mean for Your Money?
Inflation is the reason £100 today buys less than £100 did ten years ago. Understanding how it works helps explain why so many people look beyond cash savings — and what the trade-offs actually are.
For educational purposes only. This article is not financial advice. Always consult a qualified financial professional before making investment decisions.
You've probably noticed that things cost more than they used to. A coffee that was £2.50 a few years ago is now £3.50. A weekly food shop that cost £60 now costs £80. That's inflation at work — and it affects your money whether you're aware of it or not.
This article explains what inflation actually is, how it's measured, and why it's relevant to anyone thinking about what to do with their savings. As always, this is educational content only — not financial advice.
---
What Is Inflation?
Inflation is the rate at which the general level of prices for goods and services rises over time. As prices rise, each pound you hold buys a little less than it did before. Your money's purchasing power — what it can actually buy — gradually decreases.
The opposite, deflation, is when prices fall. It sounds appealing, but it comes with its own economic problems and is generally considered more dangerous than moderate inflation.
A small amount of inflation — typically around 2% per year — is considered normal and is actually the target for most central banks, including the Bank of England and the European Central Bank. The thinking is that a small, predictable rise in prices encourages spending and investment rather than hoarding cash.
---
How Is Inflation Measured?
In the UK, the most commonly cited measure is the Consumer Prices Index (CPI). It tracks the price changes of a representative basket of goods and services that a typical household buys — things like food, energy, clothing, transport, and housing costs.
When you see a headline saying "inflation is 4%", it means that basket of goods costs 4% more on average than it did a year ago. Some things in your life might have risen faster, others slower — the index is an average across many categories.
The US uses a similar measure called the Consumer Price Index. The eurozone uses the Harmonised Index of Consumer Prices (HICP). Different countries measure it slightly differently, but the underlying idea is the same.
---
What Inflation Does to Savings
Here's where it gets relevant to your finances.
If inflation is running at 3% per year and your savings account pays 1% interest, your money is growing in nominal terms (the number on the screen goes up) but shrinking in real terms (what it can actually buy goes down).
After one year, £10,000 in that account becomes £10,100. But if prices are 3% higher, you now need £10,300 to buy what £10,000 bought a year ago. In real terms, you've lost ground.
This is sometimes called the "invisible tax" of inflation — it doesn't show up as a deduction, but it quietly erodes the value of money sitting still.
---
How Inflation Has Behaved Historically
For much of the 2010s, inflation in developed economies was unusually low — often below central bank targets. Many people assumed low inflation was the new normal.
Then in 2021–2023, inflation spiked sharply across the US, UK, and Europe, driven by supply chain disruptions, energy prices, and the economic recovery from the pandemic. UK CPI hit over 11% in late 2022. That meant prices were rising at more than ten times the Bank of England's target rate.
It was a reminder that inflation can change direction quickly, and that it's worth understanding even during the quiet periods.
---
Why People Look Beyond Cash Savings
When inflation is running above the interest rates on savings accounts, cash loses real value over time. This is what leads people to explore other options — not because saving in cash is wrong, but because the maths of long-term wealth preservation starts to look different.
Historically, assets like stocks and real estate have tended to outpace inflation over long periods. Companies can raise prices alongside inflation, which can support earnings. Property values and rents often track living costs over time.
But — and this is important — these assets also come with risks that cash does not. Stocks can fall sharply in value. Property is illiquid and expensive to buy and sell. Returns are not guaranteed, and short-term performance can be very different from long-term trends.
The relevant question isn't "is investing better than saving?" — it's "what trade-offs make sense for my situation, time horizon, and risk tolerance?" That's a personal question, and often one worth discussing with a financial adviser.
---
Real Returns: The Number That Actually Matters
When evaluating any investment or savings product, the real return is what matters — the return after subtracting inflation.
If a fund returns 8% in a year when inflation is 3%, the real return is roughly 5%. That's the actual increase in purchasing power.
If a savings account pays 4.5% and inflation is 5%, the real return is roughly -0.5%. The balance is growing, but purchasing power is shrinking.
Keeping this distinction in mind helps cut through misleading comparisons. A high nominal return in a high-inflation environment might be less impressive than it looks.
---
Inflation and Portfolio Tracking
One thing a portfolio tracker shows you is nominal performance — how your holdings have changed in value in pound or dollar terms. What it generally doesn't show you is inflation-adjusted performance.
If your portfolio grew 6% last year and inflation was 4%, your real gain was closer to 2%. That context matters when you're evaluating whether your investments are actually working for you.
It's also worth knowing that dividends and income generated by a portfolio are subject to the same purchasing power erosion. A £500 annual dividend payment buys less in real terms each year if you never reinvest it.
---
A Few Things Worth Remembering
Inflation affects everyone differently. If you own a home, your biggest asset is somewhat naturally hedged against inflation. If you rent and hold most of your wealth in cash, inflation hits harder.
No one can predict inflation accurately. Even professional economists with sophisticated models regularly get it wrong. Anyone claiming to know where inflation is headed is speculating.
Protecting against inflation involves trade-offs. Every strategy — whether bonds, equities, property, gold, or something else — comes with its own risks and isn't right for everyone.
This article explains the concept and the context. It does not recommend any particular action. If you're thinking about how inflation affects your financial plans, a qualified financial adviser can help you think through the options specific to your situation.
---
The Short Version
Inflation is the gradual rise in prices over time. It reduces the purchasing power of money sitting in cash, particularly when savings rates are below the inflation rate. Understanding this helps explain why many people look at other options for long-term savings — but every alternative comes with trade-offs that need to be weighed against your own circumstances.
This article explains what inflation actually is, how it's measured, and why it's relevant to anyone thinking about what to do with their savings. As always, this is educational content only — not financial advice.
---
What Is Inflation?
Inflation is the rate at which the general level of prices for goods and services rises over time. As prices rise, each pound you hold buys a little less than it did before. Your money's purchasing power — what it can actually buy — gradually decreases.
The opposite, deflation, is when prices fall. It sounds appealing, but it comes with its own economic problems and is generally considered more dangerous than moderate inflation.
A small amount of inflation — typically around 2% per year — is considered normal and is actually the target for most central banks, including the Bank of England and the European Central Bank. The thinking is that a small, predictable rise in prices encourages spending and investment rather than hoarding cash.
---
How Is Inflation Measured?
In the UK, the most commonly cited measure is the Consumer Prices Index (CPI). It tracks the price changes of a representative basket of goods and services that a typical household buys — things like food, energy, clothing, transport, and housing costs.
When you see a headline saying "inflation is 4%", it means that basket of goods costs 4% more on average than it did a year ago. Some things in your life might have risen faster, others slower — the index is an average across many categories.
The US uses a similar measure called the Consumer Price Index. The eurozone uses the Harmonised Index of Consumer Prices (HICP). Different countries measure it slightly differently, but the underlying idea is the same.
---
What Inflation Does to Savings
Here's where it gets relevant to your finances.
If inflation is running at 3% per year and your savings account pays 1% interest, your money is growing in nominal terms (the number on the screen goes up) but shrinking in real terms (what it can actually buy goes down).
After one year, £10,000 in that account becomes £10,100. But if prices are 3% higher, you now need £10,300 to buy what £10,000 bought a year ago. In real terms, you've lost ground.
This is sometimes called the "invisible tax" of inflation — it doesn't show up as a deduction, but it quietly erodes the value of money sitting still.
---
How Inflation Has Behaved Historically
For much of the 2010s, inflation in developed economies was unusually low — often below central bank targets. Many people assumed low inflation was the new normal.
Then in 2021–2023, inflation spiked sharply across the US, UK, and Europe, driven by supply chain disruptions, energy prices, and the economic recovery from the pandemic. UK CPI hit over 11% in late 2022. That meant prices were rising at more than ten times the Bank of England's target rate.
It was a reminder that inflation can change direction quickly, and that it's worth understanding even during the quiet periods.
---
Why People Look Beyond Cash Savings
When inflation is running above the interest rates on savings accounts, cash loses real value over time. This is what leads people to explore other options — not because saving in cash is wrong, but because the maths of long-term wealth preservation starts to look different.
Historically, assets like stocks and real estate have tended to outpace inflation over long periods. Companies can raise prices alongside inflation, which can support earnings. Property values and rents often track living costs over time.
But — and this is important — these assets also come with risks that cash does not. Stocks can fall sharply in value. Property is illiquid and expensive to buy and sell. Returns are not guaranteed, and short-term performance can be very different from long-term trends.
The relevant question isn't "is investing better than saving?" — it's "what trade-offs make sense for my situation, time horizon, and risk tolerance?" That's a personal question, and often one worth discussing with a financial adviser.
---
Real Returns: The Number That Actually Matters
When evaluating any investment or savings product, the real return is what matters — the return after subtracting inflation.
If a fund returns 8% in a year when inflation is 3%, the real return is roughly 5%. That's the actual increase in purchasing power.
If a savings account pays 4.5% and inflation is 5%, the real return is roughly -0.5%. The balance is growing, but purchasing power is shrinking.
Keeping this distinction in mind helps cut through misleading comparisons. A high nominal return in a high-inflation environment might be less impressive than it looks.
---
Inflation and Portfolio Tracking
One thing a portfolio tracker shows you is nominal performance — how your holdings have changed in value in pound or dollar terms. What it generally doesn't show you is inflation-adjusted performance.
If your portfolio grew 6% last year and inflation was 4%, your real gain was closer to 2%. That context matters when you're evaluating whether your investments are actually working for you.
It's also worth knowing that dividends and income generated by a portfolio are subject to the same purchasing power erosion. A £500 annual dividend payment buys less in real terms each year if you never reinvest it.
---
A Few Things Worth Remembering
Inflation affects everyone differently. If you own a home, your biggest asset is somewhat naturally hedged against inflation. If you rent and hold most of your wealth in cash, inflation hits harder.
No one can predict inflation accurately. Even professional economists with sophisticated models regularly get it wrong. Anyone claiming to know where inflation is headed is speculating.
Protecting against inflation involves trade-offs. Every strategy — whether bonds, equities, property, gold, or something else — comes with its own risks and isn't right for everyone.
This article explains the concept and the context. It does not recommend any particular action. If you're thinking about how inflation affects your financial plans, a qualified financial adviser can help you think through the options specific to your situation.
---
The Short Version
Inflation is the gradual rise in prices over time. It reduces the purchasing power of money sitting in cash, particularly when savings rates are below the inflation rate. Understanding this helps explain why many people look at other options for long-term savings — but every alternative comes with trade-offs that need to be weighed against your own circumstances.
Track Your Portfolio with FolioTrack
See how your investments are really performing with AI-powered insights, index comparisons, and dividend tracking.
Start free 14-day trial