What Is Inflation?
Inflation is the rate at which the general level of prices for goods and services rises over time ??? and equivalently, the rate at which purchasing power falls. When inflation is 3% per year, something that cost $100 today will cost approximately $103 next year, and $134 in 10 years.
The US Federal Reserve targets 2% annual inflation as its long-term goal. The historical average since 1913 (when the Fed was established) is approximately 3.2%. During the 2021???2023 period, inflation surged to 7%???9% ??? the highest in 40 years ??? before returning toward the 3% range by 2024???2025.
How Inflation Is Measured
The most widely used measure is the Consumer Price Index (CPI), published monthly by the Bureau of Labor Statistics. CPI tracks the average price change of a "basket" of consumer goods and services including food, housing, medical care, transportation, and education. Other measures include the PCE (Personal Consumption Expenditures) ??? the Fed's preferred metric ??? and PPI (Producer Price Index) which measures wholesale prices.
The Rule of 70 for Inflation
Similar to the Rule of 72 for investments, the Rule of 70 estimates how many years it takes for prices to double: divide 70 by the inflation rate. At 3% inflation, prices double in about 23 years. At 7% inflation, prices double in just 10 years. This is why inflation is particularly damaging to retirees and savers ??? the purchasing power of fixed incomes and cash savings erodes steadily over time.
Protecting Against Inflation
- I-Bonds: US Treasury inflation-protected savings bonds ??? rate adjusts with CPI every 6 months
- TIPS: Treasury Inflation-Protected Securities ??? principal adjusts with CPI
- Real estate: Property values and rents historically rise with or above inflation
- Equities: Stocks in companies that can pass on price increases tend to outpace inflation over the long run
- HYSA / short-term CDs: In high-rate environments, these can keep pace with mild inflation
Frequently Asked Questions
What was the inflation rate in the United States historically?
US inflation has varied dramatically over the decades. Notable periods: 1970s stagflation peaked at ~14% (1980), Paul Volcker's Fed crushed it to ~3% by 1983. The 1990s???2010s averaged ~2%???3%. COVID-era supply disruptions drove it to 9.1% in June 2022 ??? the highest since 1981. By 2024???2025 it had cooled back to the 3%???4% range. The all-time US historical average since 1913 is approximately 3.2% per year.
Why is 2% the Federal Reserve's inflation target?
The Fed targets 2% because it provides a comfortable buffer above deflation (falling prices), which is considered more economically damaging than mild inflation. Deflation causes consumers to delay purchases (waiting for lower prices), which creates a deflationary spiral. At 2%, the cost of mild inflation is manageable, and the Fed has more room to cut interest rates during recessions. The 2% target was formally adopted in 2012, though it had been an informal benchmark for years prior.
How does inflation affect my savings and investments?
Cash loses purchasing power at the inflation rate ??? money under the mattress earning 0% loses 3% of its real value each year. A savings account earning 4.5% in a 3% inflation environment delivers a real return of ~1.5%. For long-term investors, the key metric is the real return ??? nominal return minus inflation. Historically, US stocks have delivered ~7% real annual returns, well above inflation. Bonds and cash savings are more vulnerable to inflation erosion over long time horizons.
Is the CPI an accurate measure of my personal inflation rate?
Not necessarily ??? CPI measures average prices for a typical consumer basket, but your personal inflation rate depends heavily on your spending patterns. If you spend a large share of income on housing in a high-cost city, or on healthcare with age, your effective inflation rate may be higher than CPI. Conversely, if you primarily buy store-brand groceries and drive an older paid-off car, your personal rate may be lower. CPI is a useful benchmark but not a perfect individual measure.
