Plain-English definitions, reviewed by an independent investor

Inflation

Inflation is the rise in prices over time, quietly shrinking the buying power of cash.

Inflation is the rise in prices over time, quietly shrinking the buying power of cash.

Inflation ≈ % Change in a Price Index (e.g. CPI)

A quick example

If inflation runs 3% a year, something that costs $100 today will cost about $103 next year, and $100 of cash quietly buys less every month. Inflation is measured through price indexes like the CPI, and its causes mix demand, supply, and expectations. It transfers wealth from savers to borrowers — debt gets repaid with cheaper dollars — which is why stocks, real estate, and other assets that can raise prices tend to outrun it, while cash and fixed-rate bonds lag. Mild inflation (2%ish) is the target; runaway inflation is a policy failure that destroys savings.

Picture this

In the 1970s, a retiree living on a fixed $2,000-a-month pension watched a loaf of bread go from 25 cents to 80 cents. Every year the pension bought less, until its purchasing power had roughly halved over the decade. Meanwhile, homeowners saw house prices and rents climb with inflation, and stock owners saw company earnings rise with prices. The scenario is the silent tax made visible: inflation does not show up on any statement, yet it decides which assets keep you whole and which quietly drain you.

What it means for you

It is the silent tax on holding cash and fixed income.

How to apply it

When setting goals, use real (inflation-adjusted) returns, not nominal ones. Keep the cash portion of a portfolio short and small, and favour assets with pricing power in inflationary periods.

Common mix-ups

Too little inflation can signal weak demand; too much erodes savings fast.

Key takeaway

Inflation is the silent tax that shrinks the buying power of cash and fixed income, and the real question for investors is whether returns beat it. Stocks and real estate tend to outrun inflation by raising prices; cash and fixed-rate bonds quietly lag it. Set goals in real terms, keep the cash portion short and small, and favour assets with pricing power. A nominal return is only the first chapter; the real return is the whole story.

Definitions reviewed by the Investing Glossary editorial team.

Frequently Asked Questions

How to beat inflation?

Assets that grow — stocks, real estate — tend to outrun it over time.

Good inflation?

Modest inflation is normal; the trouble starts when it runs hot.

What is CPI?

The Consumer Price Index, the most-cited measure of consumer inflation.

Does inflation hurt stocks?

Mild inflation is fine; runaway inflation squeezes margins and multiples.

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