Inflation and your money: why cash loses value quietly

If a coffee costs more than it did a few years ago, you have seen inflation. It is the general rise in prices over time, and it means the same amount of money buys less. Inflation is quiet, which is exactly why it matters: nothing in your bank balance changes, yet your purchasing power shrinks.

This article explains how inflation works, shows its effect with real numbers, explains the difference between nominal and real returns, and covers what you can do about it.

How inflation is measured

Statistical agencies track the price of a basket of everyday goods and services, such as food, housing, transport and healthcare, and report how much the total changes over a year. The result is a headline inflation rate. Your personal inflation can differ from the headline, because your spending mix is not the same as the average. Rent, school fees or healthcare costs may rise faster than the overall index.

The effect of time

The effect accumulates. Consider something that costs 100 today:

• At 2% inflation, it costs about 122 in 10 years.
• At 3%, about 134.
• At 5%, about 163.
• At 7%, about 197.

Looking at it from the other side, 100 held in cash today would buy about what 82 buys at 2% inflation after 10 years, about 74 at 3%, about 61 at 5% and about 51 at 7%. These are illustrations and not forecasts, because inflation varies by country and year.

Why it matters most over long periods

For short-term needs the effect is small. Over decades it is large. If you spend 40,000 a year today and inflation averages 3%, the same lifestyle costs about 83,700 a year after 25 years. That is why retirement planning must allow for rising costs, rather than assuming that today's spending is fixed.

Nominal versus real returns

A nominal return is what you earn on paper. A real return is what is left after inflation, and it is what changes your purchasing power.

If your savings earn 4% and inflation is 3%, your real return is about 1%. More precisely, it is (1.04 divided by 1.03) minus 1, which is a little under 1%. If your savings earn 2% while inflation is 3%, your real return is negative: your balance grows, but you can buy less with it.

This is the hidden cost of holding too much cash for the long term. It feels safe because the number never falls, but its value can erode.

What tends to keep pace with inflation

No asset is guaranteed to beat inflation, but over long periods some have historically done better than cash.

• Shares: companies can often raise prices, so profits and share prices have tended to grow over long periods, with large swings along the way.
• Property: rents and values have tended to rise with prices, though with costs, risks and local differences.
• Inflation-linked bonds: some governments issue bonds whose payments adjust with inflation.
• Your own income: investing in skills and career growth helps your earnings keep up.

Each of these carries its own risks, and past results do not guarantee future ones.

What to do about it

1. Keep the right amount in cash. An emergency fund and money needed within a few years belong in safe, accessible places. Do not take market risk with those funds just to chase inflation.
2. Invest longer-term money. Money you will not need for ten years or more has time to ride out market falls, and gives you a chance to earn a real return.
3. Plan with inflation built in. When estimating future costs, such as retirement spending or a child's education, increase today's figures for the expected rise in prices.
4. Watch fees. High costs reduce your real return further.
5. Review regularly. Revisit your goals each year to update for current prices.

Common mistakes

• Treating cash as risk-free over the long term.
• Judging returns by the headline number without subtracting inflation.
• Planning future spending in today's prices.
• Taking excessive risk with short-term money to try to beat inflation.

A short checklist

• I know roughly what inflation is where I live.
• I compare returns with inflation, not just with zero.
• My long-term money is invested for growth, and my short-term money is safe.
• My plans for the future allow for rising prices.

Inflation cannot be avoided, but it can be planned for. The aim is not to chase every price change. It is to make sure that, over the years, your money keeps pace with the cost of the life you want.