What Is Inflation and How Does It Affect Your Money?

Inflation is the rate at which the general price level of goods and services rises over time, reducing the purchasing power of each dollar you hold. At 3% annual inflation, something that costs $100 today will cost $134 in 10 years and $181 in 20 years. Your dollars do not shrink, but what they can buy does.

The United States has averaged about 3.3% annual inflation since 1913, when the Bureau of Labor Statistics started tracking the Consumer Price Index (CPI). That means a basket of goods costing $100 in 1913 costs over $3,100 today. Some periods saw much higher inflation: the 1970s averaged 7.4%, and 2022 peaked at 9.1%. Other periods were calmer: 2010-2020 averaged just 1.8%.

How Inflation Is Measured

The most common measure is the Consumer Price Index (CPI), published monthly by the Bureau of Labor Statistics. The CPI tracks the price changes of a basket of about 80,000 goods and services that typical urban consumers buy: food, housing, transportation, medical care, education, and more. When the CPI rises 3% over a year, we say inflation was 3%.

Core CPI excludes volatile food and energy prices, giving a cleaner signal of underlying inflation trends. The Federal Reserve also watches the Personal Consumption Expenditures (PCE) price index, which uses a slightly different methodology and tends to run 0.3-0.5% lower than CPI. The Fed's target inflation rate is 2% per year, measured by PCE.

What Causes Inflation

Demand-pull inflation happens when consumers and businesses want to buy more goods and services than the economy can produce. Too many dollars chasing too few goods pushes prices up. The COVID-era stimulus checks combined with supply chain disruptions created a textbook case of demand-pull inflation in 2021-2022.

Cost-push inflation occurs when production costs rise, forcing businesses to raise prices. Oil price spikes, supply chain breakdowns, and wage increases all push costs higher. When gas prices surge, nearly everything gets more expensive because transportation costs are embedded in the price of virtually every product.

Monetary inflation results from the money supply growing faster than economic output. The Federal Reserve controls this through interest rates and quantitative easing. When the Fed created $4.6 trillion in new money during 2020-2021, it contributed to the inflation that followed. The Fed then raised interest rates aggressively in 2022-2023 to pull that inflation back down.

How Inflation Affects Your Savings

Cash sitting in a checking account earning 0.1% loses purchasing power every year. At 3% inflation, $50,000 in cash loses $1,500 in real value per year. After 10 years, your $50,000 can only buy what $37,200 could buy today. After 20 years, it is worth only $27,700 in today's dollars. Holding large amounts of cash is one of the most reliable ways to lose money slowly.

High-yield savings accounts (currently offering 4-5% APY as of early 2026) outpace current inflation, preserving purchasing power. But over long periods, even a small gap between your savings rate and inflation compounds against you. If inflation averages 3% and your savings earn 2%, you lose 1% of real purchasing power every year.

How Inflation Affects Investments

Stocks have historically been the best long-term inflation hedge, returning about 10% annually (roughly 7% after inflation). Real estate also tends to keep pace with or exceed inflation, since both property values and rents rise with the general price level. Bonds are mixed; they pay fixed interest, so unexpected inflation erodes their real return. Treasury Inflation-Protected Securities (TIPS) directly adjust for CPI changes.

When evaluating investment returns, always think in real terms. A fund returning 8% sounds great, but if inflation is 5%, your real return is only 3%. The approximate formula: Real Return ≈ Nominal Return - Inflation Rate. A more precise calculation: Real Return = (1 + Nominal) / (1 + Inflation) - 1.

Inflation and Retirement Planning

Inflation is the silent enemy of retirement planning. A retiree who needs $60,000 per year today will need about $108,000 per year in 20 years (at 3% inflation) to maintain the same lifestyle. Social Security has cost-of-living adjustments (COLA) that partially address this, but pension payments without COLA lose purchasing power steadily.

A retirement portfolio must grow fast enough to cover withdrawals AND inflation. The classic 4% withdrawal rule already accounts for inflation: you withdraw 4% in year one, then increase the dollar amount by the inflation rate each year. If your portfolio cannot sustain this, you face the real risk of outliving your money.