What Is Inflation? Definition, Types, Causes, and Effects
Last updated 04/07/2026 by
Ante Mazalin
Edited by
Andrew Latham
Summary:
Inflation is the rate at which the general price level of goods and services rises over time, reducing the purchasing power of money.
It takes several forms, each driven by different economic forces.
- Demand-pull inflation: Occurs when consumer demand outpaces supply, pushing prices upward across the economy.
- Cost-push inflation: Driven by rising production costs — such as wages or raw materials — that businesses pass on to consumers.
- Built-in inflation: A self-perpetuating cycle where workers expect higher wages because prices are rising, which in turn raises business costs and prices further.
- Hyperinflation: An extreme form where prices rise so rapidly that currency loses value almost entirely, as seen in Zimbabwe (2008) and Weimar Germany (1923).
Inflation touches nearly every financial decision you make — from what you pay at the grocery store to the interest rate on your next loan. Understanding how it works gives you the context to make better choices about saving, investing, and borrowing.
How Is Inflation Measured?
The U.S. Bureau of Labor Statistics (BLS) measures inflation primarily through the Consumer Price Index (CPI), which tracks the price changes of a fixed basket of goods and services bought by typical urban households.
Three key measures are used by economists and policymakers:
| Measure | What It Tracks | Who Uses It |
|---|---|---|
| Consumer Price Index (CPI) | Retail prices paid by consumers for a basket of goods | BLS; widely reported in media |
| Core CPI | CPI excluding food and energy (more volatile categories) | Federal Reserve for policy decisions |
| Personal Consumption Expenditures (PCE) | Broader range of spending, adjusts for consumer substitutions | Fed’s preferred inflation gauge |
| Producer Price Index (PPI) | Prices received by producers — a leading indicator of consumer inflation | Economists, business planners |
The Federal Open Market Committee (FOMC) targets a 2% annual inflation rate as its definition of “price stability” — low enough to avoid economic harm, high enough to discourage deflation.
What Causes Inflation?
Inflation rarely has a single cause. It typically emerges when too much money chases too few goods — but the specific driver shapes how long it lasts and how it’s best addressed.
Demand-pull factors include government stimulus spending, low interest rates that encourage borrowing, and wage growth that boosts consumer purchasing power. The post-pandemic inflation surge of 2021–2023 was partly demand-pull, fueled by $5 trillion in federal stimulus alongside supply chain disruptions.
Cost-push factors include rising energy prices (oil shocks), commodity price spikes, and global supply chain bottlenecks. When it costs more to make or transport goods, those costs flow downstream to consumers.
Monetary expansion — when a central bank increases the money supply faster than economic output grows — is a longer-run driver. Milton Friedman’s famous observation holds: “Inflation is always and everywhere a monetary phenomenon.”
How Inflation Affects Your Money
At 3% annual inflation, $100 today buys what $97 bought a year ago. Over a decade, that same $100 loses roughly 26% of its purchasing power. The math compounds quietly but relentlessly.
The effects hit different parts of your financial life differently:
- Savings: Cash held in low-yield accounts loses real value when the interest rate is below the inflation rate. A savings account earning 0.5% during 4% inflation loses 3.5% in real terms annually. High-yield savings accounts at online banks narrow this gap significantly.
- Fixed-rate debt: Inflation actually helps borrowers with fixed-rate loans — you repay future dollars that are worth less than the dollars you borrowed. This is why homeowners with 30-year fixed mortgages benefit during inflationary periods.
- Investments: Equities historically outpace inflation over long periods. The S&P 500 has returned an average of approximately 10% annually over the past 50 years, well above average inflation rates.
- Wages:Real wages (wages adjusted for inflation) can fall even when nominal wages rise, if inflation outpaces raises. From 2021–2022, U.S. real wages declined for 25 consecutive months despite nominal wage growth.
- Retirement savings: Retirees on fixed incomes are especially exposed — $1,500/month in retirement income buys less each year inflation runs above zero.
Pro Tip: Series I Savings Bonds (I Bonds) are issued by the U.S. Treasury and earn interest tied directly to the CPI inflation rate. During the 2022 inflation peak, I Bonds yielded 9.62% — one of the few savings vehicles that genuinely kept pace with inflation. Inflation-linked CDs are another option worth considering for cash you want to protect. The annual I Bond purchase limit is $10,000 per person through TreasuryDirect.gov.
What Types of Inflation Are There?
Economists classify inflation by both its cause and its severity:
| Type | Annual Rate | Description |
|---|---|---|
| Creeping inflation | 1–3% | Mild and manageable; consistent with healthy economic growth |
| Walking inflation | 3–10% | Noticeable enough to alter consumer and business behavior |
| Galloping inflation | 10–1,000% | Seriously damages economic stability; erodes savings rapidly |
| Hyperinflation | 1,000%+ | Economic collapse territory; currency becomes nearly worthless |
Two additional supply-side variants are worth knowing: cost-push inflation, where rising production costs drive prices up, and wage-push inflation, where rising labor costs trigger a broader price spiral.
How the Federal Reserve Controls Inflation
The Federal Reserve Board‘s primary tool for managing inflation is the federal funds rate — the interest rate at which banks lend to each other overnight. When the FOMC raises this rate, borrowing becomes more expensive throughout the economy, which reduces spending and cools demand-driven price increases.
Between March 2022 and July 2023, the Fed raised rates 11 times — from near zero to a 22-year high of 5.25–5.50% — in the most aggressive tightening cycle since the early 1980s. By mid-2024, headline CPI had fallen from a peak of 9.1% (June 2022) back toward the Fed’s 2% target.
The Fed also uses open market operations and quantitative tightening (QT) — the reverse of quantitative easing — to shrink the money supply and apply additional downward pressure on inflation. Whether the Fed takes a hawkish or dovish stance signals its inflation priorities to markets.
How to protect your money from inflation
These steps can help preserve your purchasing power when inflation rises:
- Move cash into high-yield savings accounts. Online banks with lower overhead pass rate increases through quickly, often offering 4–5%+ APY during high-rate environments — far better than the national average of 0.45–0.58% at traditional banks.
- Invest in inflation-resistant assets. Historically, equities, real estate, and commodities outpace inflation over long time horizons. TIPS (Treasury Inflation-Protected Securities) adjust their principal with the CPI. Inflation-linked CDs offer another low-risk hedge for shorter time horizons.
- Lock in fixed-rate debt now. If interest rates are expected to rise further, refinancing variable-rate debt to a fixed rate protects you from rate increases driven by inflation-fighting policy.
- Negotiate salary adjustments. Cost-of-living adjustments (COLAs) tied to CPI are a standard part of employment contracts in unionized sectors — and a reasonable ask in non-unionized roles during high-inflation periods. Track your real income to see whether your wages are actually keeping up.
- Diversify internationally. If domestic inflation is unusually high, foreign assets denominated in stronger currencies can preserve real value.
Inflation vs. Deflation vs. Stagflation
Inflation is one point on a spectrum of price-level conditions, each with distinct economic implications:
- Deflation is a general decline in prices. It sounds beneficial, but it’s dangerous — consumers delay purchases expecting prices to fall further, which reduces demand and can tip an economy into recession. Japan experienced “lost decades” of deflationary stagnation starting in the 1990s.
- Disinflation is a slowdown in the rate of inflation — prices are still rising, just more slowly. This is the soft-landing scenario central banks aim for when tightening policy.
- Stagflation is the most feared combination: high inflation paired with slow economic growth and high unemployment. It’s hard to treat because the standard cure for inflation (raising rates) makes unemployment worse. The U.S. experienced stagflation in the 1970s following the OPEC oil embargo.
For a deeper look at how inflation is actually calculated month to month, see SuperMoney’s guide to calculating the inflation rate and the 2025 Inflation Study.
Key takeaways
- Inflation is the rate at which prices rise over time, reducing the purchasing power of each dollar.
- The Federal Reserve targets 2% annual inflation as its definition of price stability.
- CPI and PCE are the two primary inflation measures; the Fed prefers PCE for policy decisions.
- Inflation helps fixed-rate borrowers and hurts savers holding cash in low-yield accounts — high-yield savings accounts reduce this gap.
- The Fed raises the federal funds rate to slow inflation by making borrowing more expensive and reducing demand.
- TIPS, I Bonds, inflation-linked CDs, equities, and real estate are the most common inflation-resistant asset classes.
- Stagflation — simultaneous high inflation and high unemployment — is the hardest inflation scenario to address with monetary policy.
Frequently Asked Questions
What is a good inflation rate?
Most central banks, including the U.S. Federal Reserve, target 2% annual inflation. At this level, prices rise slowly enough not to erode savings significantly, but fast enough to discourage deflation — which can be economically more damaging than mild inflation.
What is the current inflation rate?
Inflation rates change monthly. The U.S. Bureau of Labor Statistics publishes updated CPI data every month at bls.gov. SuperMoney’s 2025 Inflation Study provides a deeper look at recent trends and their consumer impact.
How does inflation affect interest rates?
Higher inflation typically leads the Federal Reserve to raise the federal funds rate to cool economic activity and reduce price pressure. This flows through to higher rates on mortgages, auto loans, credit cards, and savings accounts. The relationship between nominal rates and inflation is captured by the real interest rate: real rate = nominal rate − inflation rate.
Does inflation affect everyone equally?
No. Lower-income households are disproportionately affected because they spend a larger share of their income on necessities like food and energy — which tend to rise faster than overall inflation. Higher earners have more of their wealth in assets that appreciate with inflation, providing a natural hedge. Track changes to your own situation using the real income formula.
What is the difference between inflation and the cost of living?
Inflation is a measure of price changes across the entire economy. The cost of living is location-specific — it reflects what it actually costs to maintain a given standard of living in a particular city or region. A city can have a high cost of living even during low national inflation, depending on local housing and service costs.
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