Money, Explained From the Inside

Learn / Part 1 · How Money Works

The Quiet Tax: Inflation and Purchasing Power

Why does the same money buy less every year?

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In brief

Inflation raises prices steadily, so money that sits still quietly loses buying power. Judging any saving or investment means looking at the real return, after inflation.

Key ideas

1

Real, not nominal

A 4% return in a year with 3% inflation adds about 1% to what you can buy. Statements show nominal figures; life runs on real ones.

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2

A quiet tax

No one sends a bill for inflation; it simply shrinks what you hold. Cash beyond a buffer pays it year after year.

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3

Your own inflation

The headline rate is an average. Your costs may rise faster or slower, especially housing, health and education.

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Try it

The quiet tax

Inflation never sends a bill. It makes each unit of money buy a little less every year. Compare idle cash with money that earns a return.

Try an example
Idle cash will buy only
$5,53745% of its purchasing power is gone
To keep today’s buying power you will need
$18,061
Something costing 100 today costs
181
Real return (after inflation)
1.94%Not return minus inflation: (1 + return) ÷ (1 + inflation) − 1.
If invested: value in today’s money
$14,691
05k10k15k20k036912151820
Years on the horizontal axis.
  • Idle cash, buying power
  • Invested, buying power

What this means

The quiet tax is paid by anyone who holds more cash than they need, for longer than they need. A buffer is not wasted, but a pile far beyond it is slowly shrinking.

The return you actually keep is the real return. When inflation is high, a headline “5%” can be close to nothing.

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Red flag

An advertised “guaranteed” return that is lower than inflation.

Ask before you sign

  • What is the real return after inflation?
  • What happens to buying power if prices keep rising at the recent rate?
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Do this week

Check what your savings account pays against current inflation.

Try it · 10–45 minutes

Pick three things you buy often and find what they cost ten years ago. Compute the yearly rise.

Connected ideas

Where else this shows up

Pause and reflect

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Words worth knowing

Inflation
A general rise in prices, which reduces what each unit of money can buy.
Purchasing power
What a given amount of money can buy. Inflation reduces it.
Nominal (vs real)
A figure not adjusted for inflation. Real figures are adjusted so they show buying power.
Real return
An investment’s return after subtracting inflation: what it adds to buying power.

Full glossary →

← 1. The Language of Money3. The Price of Time: Interest and Compounding →

Companion notes written for this website, based on the topics of Chapter 2. They explain ideas and do not reproduce the book. General information, not personal advice.

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