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How Inflation Affects Your Money

Inflation is the gradual increase in the price of goods and services over time. As prices rise, each dollar you hold buys less — this is known as the erosion of purchasing power. Understanding inflation is critical for long-term financial planning.

What Is CPI?

The Consumer Price Index (CPI) is the most widely used measure of inflation in the United States. It tracks the average change in prices paid by urban consumers for a basket of goods and services, including food, housing, transportation, and medical care. The Bureau of Labor Statistics (BLS) publishes CPI data monthly.

The Rule of 72 for Inflation

Just as the Rule of 72 can estimate how long it takes an investment to double, you can use it to see how quickly inflation cuts your purchasing power in half. Divide 72 by the annual inflation rate to get the number of years it takes for prices to double:

• At 2% inflation, prices double in about 36 years
• At 3% inflation, prices double in about 24 years
• At 5% inflation, prices double in about 14 years

Why Inflation Matters for Your Investments

When planning for retirement or long-term goals, you must account for inflation. A nest egg that looks comfortable today may not stretch as far 20 or 30 years from now. The "real return" on your investments is your nominal return minus the inflation rate. If your portfolio earns 7% but inflation averages 3%, your real return is only about 4%.

This is why financial advisors recommend keeping a portion of your portfolio in assets that historically outpace inflation, such as stocks and real estate, rather than holding too much in cash or low-yield bonds.

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