How Inflation Erodes Purchasing Power
Inflation is the gradual increase in prices over time — meaning the same amount of money buys less in the future than it does today. The US Federal Reserve targets a 2% annual inflation rate as healthy for the economy. At 2% inflation, $100 today will only buy what $82 buys in 10 years — and $67 worth of goods in 20 years.
How Inflation Is Measured
The most common measure is the Consumer Price Index (CPI), which tracks price changes for a basket of everyday goods and services: food, housing, transportation, medical care, and more. The Bureau of Labor Statistics (BLS) publishes CPI data monthly. This calculator uses historical CPI data to show real purchasing power changes over time.
How to Protect Your Money From Inflation
- Invest in stocks — Equities have historically outpaced inflation by 5–7% annually over the long term
- TIPS (Treasury Inflation-Protected Securities) — Government bonds that automatically adjust with CPI
- Real estate — Property values and rental income tend to rise with inflation
- I-Bonds — US Savings Bonds with interest rates tied directly to CPI
- Avoid holding too much cash — Cash savings lose real value every year in a high-inflation environment
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Frequently Asked Questions
What has been the average US inflation rate historically?
The average US inflation rate has been approximately 3.2% per year since 1913. The Fed targets 2% as a healthy long-term rate. Inflation peaked above 9% in 2022 before falling back toward 3–4% by 2024.
Why does the government allow inflation at all?
Moderate inflation (around 2%) encourages spending and investment — if prices are stable or rising, people are incentivized to spend and invest rather than hoard cash. Deflation (falling prices) is actually more dangerous, as it can cause economic contraction: people delay purchases expecting lower prices, businesses earn less, and unemployment rises.
How does inflation affect retirement savings?
At 3% annual inflation, $1,000,000 in retirement savings today will only have the purchasing power of about $744,000 in 10 years and $554,000 in 20 years. This is why retirement planning must account for inflation — your investments need to grow faster than inflation to maintain purchasing power.