How Inflation Erodes Purchasing Power
Inflation erodes purchasing power by raising the prices of goods and services, so each dollar buys a little less over time. The U.S. Bureau of Labor Statistics measures this with the Consumer Price Index (CPI), and its free online calculator shows how much a past sum would need to be today to buy the same things. Even modest annual inflation compounds into large losses over decades, which is why some savers look for assets, including precious metals, that may help preserve value.
What the CPI Measures
The CPI tracks the average change over time in prices paid by urban consumers for a basket of goods and services: housing, food, transportation, medical care, apparel, recreation, education, and more. The BLS collects prices every month across many U.S. cities. The best-known series is CPI-U, covering all urban consumers.
The BLS also publishes "core" CPI, which excludes food and energy because those prices are especially volatile. Core figures can make it easier to see the underlying trend, but households still pay for food and energy, so the headline number reflects lived experience more closely.
Using the BLS CPI Inflation Calculator
The CPI Inflation Calculator converts a dollar amount from one month and year to another, going back to 1913. Here is how to use it:
- Enter a dollar amount, for example a past salary or the price of a home.
- Pick the starting month and year.
- Pick the ending month and year, usually the latest available.
- Click Calculate. The result is the amount that would have the same buying power at the later date.
Try a few examples from your own life. Run a sum from the 1970s or 1980s and you will typically see that several times as many dollars are needed now. That gap is the purchasing power cash has lost.
How Compounding Magnifies Inflation
Inflation compounds the same way interest does. At a steady 3% annual rate, prices roughly double in about 24 years. At 2%, they double in about 36 years. At 7%, about every 10 years. A useful shortcut is the "rule of 72": divide 72 by the inflation rate to estimate how many years it takes for prices to double, and for a dollar to lose half its buying power.
Who Feels It Most
- Savers holding cash earning less in interest than the rate of inflation lose real value every year. FRED, from the Federal Reserve Bank of St. Louis, publishes historical interest rates and CPI so you can compare the two.
- People on fixed incomes without cost-of-living adjustments see their budget buy less each year.
- Lenders and bondholders receiving fixed payments lose real value if inflation outpaces what they expected.
Borrowers with fixed-rate debt, by contrast, can benefit as they repay in dollars worth less than the ones they borrowed.
What Drives Inflation
Economists cite many causes: demand growing faster than supply, supply shocks such as oil embargoes or pandemic disruptions, rising wages and costs, and growth in the money supply. The Federal Reserve has a mandate to pursue stable prices and maximum employment and has said it targets 2% inflation over the longer run, as measured by the PCE price index. Its monetary policy page explains its tools.
How Precious Metals May Play a Role
Some people hold gold and silver as a potential hedge against the loss of purchasing power. The reasoning is that metals are tangible, their supply grows slowly, and they cannot be created by monetary policy. Over very long periods, gold's dollar price has risen substantially as the dollar's purchasing power fell.
The relationship is far from exact, though:
- Gold has gone through long periods, such as the 1980s and 1990s, when its price declined even as consumer prices rose.
- In the short run, gold often responds more to interest rates, the dollar, and sentiment than to the latest CPI report.
- Silver has historically been more volatile than gold because of its industrial demand.
Our pages on gold and inflation and silver and inflation examine the record. You might also compare gold with Treasury Inflation-Protected Securities, which are designed to track CPI directly.
Practical Steps
Protecting purchasing power usually involves several tools, not one. Many households keep a cash emergency fund, hold growth assets for the long run, and consider whether a portion of savings might go to physical metals as one way to diversify. For guidance on your own mix, speak with a licensed financial professional.
If you are researching physical metals, Goldco is a precious metals company that offers gold and silver for direct purchase and for self-directed retirement accounts, plus a free Gold & Silver Kit. Our page on Goldco's free kit describes what it contains, and our Goldco review covers the process.
Frequently Asked Questions
What is a "normal" inflation rate?
The Federal Reserve targets 2% over the longer run, measured by the PCE price index. Actual inflation has been both well below and well above that at different times.
Is CPI the same as my personal inflation rate?
Not exactly. CPI reflects an average basket. Your own costs may rise faster or slower depending on where you live and what you buy.
Does gold always beat inflation?
No. Over long periods gold has broadly kept pace, but there have been extended stretches when it lagged well behind.
Where can I see historical CPI data?
The BLS CPI pages and FRED both publish monthly historical data you can chart and download.