Inflation is a sustained rise in the general level of prices, which is the same thing as a sustained fall in what each unit of money buys. When inflation runs at 3 percent, a basket of goods that cost $100 last year costs about $103 this year; your salary is not automatically different, so the gap comes out of your purchasing power. It is why your grandparents' movie ticket cost a fraction of yours, why a savings account can lose ground even while its balance grows, and why central banks treat a stable, low rate of inflation as the foundation of everything else they do. This article explains how inflation is measured, why prices rise, exactly how it erodes or occasionally helps different parts of your finances, and what you can realistically do about it.
How Inflation Is Measured
In most countries a statistical agency tracks prices for a large basket of goods and services that typical households buy: housing, food, energy, transport, healthcare, education. In the United States that is the Consumer Price Index, CPI, published monthly by the Bureau of Labor Statistics. The percentage change in that index from a year earlier is the inflation rate you see in headlines.
Two refinements matter. Core inflation strips out food and energy prices, which swing wildly for reasons unrelated to underlying demand, so it shows the trend policymakers actually steer by. And the Federal Reserve officially targets not CPI but a related gauge, the Personal Consumption Expenditures price index, PCE, which weights spending differently. When you hear the Fed has a 2 percent target, that number refers to PCE inflation, and the two measures usually run a few tenths of a point apart.
Why Prices Rise
Inflation comes from a few recurring sources, usually in combination:
- Demand outstripping supply. When households and businesses want to buy faster than the economy can produce, prices get bid up. The post-pandemic period was a case study: stimulus payments, pent-up savings, and reopened economies met supply chains that could not yet deliver.
- Cost-push shocks. When key inputs become scarce or expensive, for example oil after Russia's 2022 invasion of Ukraine, producers pass costs through, and prices rise across the economy even though demand has not changed.
- Wage-price dynamics. Rising prices push workers to demand higher pay, which raises business costs, which pushes prices up again. Moderately, this is a healthy adjustment; runaway, it becomes the spiral everyone fears.
- Expectations. If households and firms expect 8 percent inflation, workers demand 8 percent raises and firms raise prices in advance, which tends to make the expectation self-fulfilling. This is why central banks care so much about their credibility in keeping expectations anchored.
- Money and credit growth. Over long horizons, sustained rapid growth in the money supply, typically to finance deficits, has historically ended in high inflation, from Weimar Germany to modern episodes in emerging economies.
What Inflation Does to Your Money, in Actual Numbers
The erosion compounds silently. Here is what $100 of purchasing power becomes after ten years of steady inflation, at three different rates:
| Annual inflation | $100 buys, after 10 years | Historical context |
|---|---|---|
| 2 percent | about $82 | Typical central bank target environment |
| 3 percent | about $74 | Approximate late-2025 US level after the surge faded |
| 9 percent | about $42 | Near the June 2022 US peak of 9.1 percent |
Read the 9 percent line twice if you lived through it: at that pace, half of a cash balance's purchasing power evaporates in roughly eight years. This is why a savings account paying 0.5 percent during 3 percent inflation is not safety but a slow leak, and why the same account paying 4.5 percent during 3 percent inflation is real, if modest, growth. The difference between the nominal rate you earn and the inflation rate is your real return, and it is the only return that matters. [Internal Link: What Is a Bank Interest Rate and How Does It Work?]
Who Wins and Who Loses
Inflation redistributes wealth in predictable directions. Losers include anyone holding cash and near-cash: savings accounts at low rates, idle balances, and holders of long-term fixed-rate bonds whose payments were set before the surge. Fixed-income households, particularly retirees on pensions that do not adjust with prices, lose quietly every month. Workers also lose whenever wages lag prices, which they chronically do during inflationary bursts: real wages fell across much of 2021 and 2022 in the US even as nominal pay rose.
Winners include borrowers with fixed-rate debt. A household that locked a 30-year mortgage at 3 percent in 2021 saw its payment stay frozen while prices and, eventually, wages rose, so the debt shrank in real terms each year. Owners of real assets, property, stocks, and commodities, have historically held or grown purchasing power over inflationary periods, though not smoothly. Governments win quietly too: inflation erodes the real value of their debt, and pushes taxpayers into higher brackets where tax brackets are not indexed, which is why indexation matters.
The Surge You Just Lived Through
The 2021 to 2023 episode is worth knowing precisely because it broke a 30-year pattern. From the early 1990s until 2021, US inflation stayed remarkably tame, mostly between 1 and 4 percent, and an entire generation of consumers and investors had never seen the alternative. Then the collision of pandemic stimulus, disrupted supply chains, energy shocks, and shifting spending produced a peak of 9.1 percent in June 2022, the highest in roughly four decades. The Federal Reserve responded with its fastest rate increases since the early 1980s, lifting its policy rate from near zero to 5.25 to 5.50 percent by mid-2023. Inflation cooled steadily afterward, running near 3 percent by late 2025, though the level of prices stayed far above where it began: disinflation, a slowing of price increases, is not deflation, a fall in prices, and the higher price level never went back down.
What Central Banks Do About It
Most major central banks target inflation around 2 percent: low enough that it does not distort decisions, high enough to avoid deflation, falling prices, which historically paralyzes spending and worsens debt burdens. The main tool is the policy interest rate: raising rates cools borrowing and spending, easing demand pressure on prices; cutting rates does the reverse. The full mechanism is covered in [Internal Link: How Do Interest Rates Affect the Economy?]. The trade-off is employment: the same rate increases that cool inflation also slow hiring and growth, which is why every inflation fight involves judging how much pain is necessary, and why the early 1980s episode under Paul Volcker, with rates pushed high enough to cause a deep recession, remains the reference point for what breaking entrenched inflation has historically cost.
What You Can Realistically Do
You cannot stop inflation; you can arrange your finances so it does less damage. General educational points, not personalized advice:
- Keep only near-term needs in cash. The emergency fund and money needed within a few years belong in savings; money parked for decades in cash is guaranteed to lose purchasing power.
- Own assets with pricing power. Over long periods, diversified stock portfolios and real property have historically outpaced inflation, because the underlying businesses and assets raise prices too. History is not a guarantee, but the alternative has a guaranteed outcome.
- Consider inflation-linked instruments where appropriate. Treasury Inflation-Protected Securities, TIPS, and I Bonds in the US adjust principal or rates with CPI, trading some simplicity for certainty of real value.
- Negotiate pay in real terms. A 3 percent raise during 3 percent inflation is a pay freeze. Comparisons should be against price changes, not last year's number.
- Refinance judiciously. Fixed-rate debt taken before an inflation surge is an asset; variable-rate debt during one is a liability, as rates climb with the central bank's response.
Frequently Asked Questions
Is some inflation actually good?
Modest inflation greases the economy in real ways. It allows real wages to adjust downward without nominal pay cuts, which keeps employment smoother; it erodes the real burden of debt gradually; and it gives central banks room to cut rates in a recession before hitting zero. The problems start when inflation is high, volatile, or unanchored, all of which distort saving, lending, and planning.
Why do my prices feel like they rise faster than the official rate?
Because CPI is an average of a basket, not your basket. Housing, insurance, and services you buy weekly may be inflating faster than categories where prices fall, like electronics. Personal inflation varies with what you actually spend on, which is why the official figure can feel out of step with your grocery receipt while both are accurate.
Should I fear deflation more than inflation?
Policymakers do, at least modest amounts of it. Falling prices sound pleasant and are corrosive: shoppers delay purchases expecting cheaper prices later, revenues and wages fall, debts become heavier in real terms, and the cycle can entrench itself, as Japan's long stagnation and the Great Depression both illustrate. Central banks therefore aim at small positive inflation partly as a buffer against deflation.
The Bottom Line
Inflation is the silent tax on money left still: at 3 percent it costs a fifth of purchasing power in a decade, and at the 2022 peak it was halving cash balances in under eight years. It is measured by CPI and PCE, driven by demand, supply shocks, wages, and expectations, and managed by central banks targeting about 2 percent at the cost of higher rates. The individual defense is structural: keep cash only where certainty is worth the leak, hold diversified assets that historically keep pace, and read every rate and raise in real terms.