Finance
Inflation: What It Actually Does to Your Money and Debt
Inflation is the rate at which money loses purchasing power. At 3% a year, prices double roughly every 24 years; at 8%, every nine. The mechanism is invisible day to day and enormous over a lifetime — which is exactly why it's worth understanding rather than just resenting.
How it's measured, and why it never matches your experience
Headline CPI tracks a weighted basket of what an average household buys. You are not average: renters in expensive cities, parents paying tuition, and heavy drivers each live in different inflation realities. Economists also watch "core" inflation (excluding food and energy) — not because groceries don't matter, but because volatile commodity swings obscure the underlying trend policy can actually respond to. Both numbers are honest answers to slightly different questions.
Why central banks target 2% instead of 0%
Zero sounds ideal but sits dangerously close to deflation — falling prices that cause consumers to delay purchases, which shrinks demand, which cuts wages and jobs, which delays purchases: a spiral that's historically been much harder to escape than inflation. A small positive buffer also lets real wages adjust without nominal pay cuts and keeps interest rates far enough above zero for central banks to cut in recessions. Two percent is less a magic number than a margin of safety.
The redistribution nobody votes on
Inflation quietly moves wealth between groups. It punishes cash savings and fixed incomes. It rewards fixed-rate borrowers: a 30-year mortgage at 4% during 7% inflation is being repaid in dollars that shrink faster than the interest accrues — the lender is effectively paying you. This is also the story of government debt: inflation erodes the real value of what's owed, a dynamic politely called "financial repression" when policymakers let it run. Understanding who wins and loses explains most of the politics around it.
What actually protects purchasing power
- Equities, over long horizons: businesses raise prices too — revenues and dividends are nominal quantities that grow with the price level. Over decades stocks have been the most reliable inflation-beater, though over any given year they can fall alongside everything else (2022's simultaneous stock-and-bond drawdown made this vivid).
- Inflation-indexed bonds (TIPS, I-bonds): the only instruments that contractually track CPI. The honest baseline for truly safe money.
- Real assets: property and commodities have inflation-linked cash flows or prices, with their own cycles and carrying costs.
- Your own earning power: the most underrated hedge. Skills that command market wages reprice with inflation; a stagnant salary is a bond you didn't know you owned. In inflationary periods, negotiating pay is portfolio management.
Cash still has a job — emergencies and near-term spending — but a large balance parked for years at below-inflation rates is a slow, certain loss dressed up as safety. Inflation is a tax on standing still; the goal is to make sure most of your net worth isn't.