Inflation: The Silent Thief That Erodes Your Purchasing Power

Your money is losing value right now, even if your account balance is growing

In 1990, a gallon of gas cost $1.16. A movie ticket was $4.23. A new car averaged $15,400. Today those same items cost roughly three times as much. Your dollar did not change. What it can buy did.

This is inflation. It does not take money from your account. It takes value from every dollar in it. And unlike a market crash, which is dramatic and visible, inflation is so gradual that most people do not feel it happening until they look back over a decade and realize their money no longer goes as far as it used to.

What Inflation Actually Is

Inflation is the rate at which the general price level of goods and services rises over time. When inflation is 3%, something that costs $100 today will cost $103 next year. Your $100 bill still says $100, but it buys less.

The most common measure of inflation in the United States is the Consumer Price Index (CPI), published monthly by the Bureau of Labor Statistics. The CPI tracks the price changes of a basket of goods and services that represents typical consumer spending: housing, food, transportation, medical care, education, and more [Bureau of Labor Statistics, 2024].

Over the past century, U.S. inflation has averaged approximately 3% per year [Federal Reserve Bank of Minneapolis, Historical CPI data]. Some years it is lower (2015 saw only 0.1%), some years dramatically higher (2022 hit 9.1%, the highest in 40 years). But the long-term trend is persistent and one-directional: prices go up.

The Math That Should Concern You

At 3% annual inflation, here is what happens to the purchasing power of $1,000,000:

After 10 years: $737,424 in today's dollars
After 20 years: $543,794 in today's dollars
After 30 years: $401,013 in today's dollars

Your account still says $1,000,000. But it buys what $401,000 buys today. You have lost nearly 60% of your purchasing power without losing a single dollar.

This is why people who keep large amounts in savings accounts or under the mattress are slowly going broke. A savings account paying 0.5% while inflation runs at 3% means you are losing 2.5% of your purchasing power every year. That is not saving. That is a slow leak.

Nominal Returns vs. Real Returns

This is one of the most important distinctions in investing, and one that many investors overlook entirely.

Nominal return is what your investment account shows you. If your portfolio went up 8% this year, that is your nominal return.

Real return is your nominal return minus inflation. If your portfolio went up 8% but inflation was 3%, your real return was approximately 5%. That 5% is what you actually gained in purchasing power.

The historical nominal return of the S&P 500 is approximately 10% per year since 1926 [Ibbotson Associates, SBBI data]. The historical real return, after subtracting inflation, is approximately 7%. That 3% difference is inflation taking its share every single year.

Why does this matter? Because your financial goals are in real dollars, not nominal dollars. If you need $80,000 per year to live on in retirement, you need $80,000 in today's purchasing power. If you retire in 25 years and inflation has averaged 3%, you will need approximately $167,000 per year to maintain the same standard of living. The number on your retirement plan must account for this, or you are planning for a retirement that gets cheaper every year, which is the opposite of reality (especially with healthcare costs rising faster than general inflation).

What Drives Inflation

Inflation has multiple causes, and economists debate their relative importance. The major drivers include:

Demand-pull inflation

When demand for goods and services exceeds supply, prices rise. The post-COVID period of 2021-2022 illustrated this vividly: massive fiscal stimulus put cash in consumers' hands while supply chains were disrupted, producing the highest inflation in four decades [Federal Reserve Economic Data, 2023].

Cost-push inflation

When the cost of producing goods rises (raw materials, labor, energy), those costs get passed to consumers. Oil price shocks are a classic example. The 1973 oil embargo and the 2022 energy crisis both triggered cost-push inflation that rippled through the entire economy.

Monetary inflation

When the money supply grows faster than the economy, each dollar becomes less valuable. The Federal Reserve's quantitative easing programs after 2008 and during COVID massively expanded the money supply, though the relationship between money supply and consumer prices is more complex and delayed than basic theory suggests [Federal Reserve Bank of St. Louis, 2023].

Expectations

If consumers and businesses expect prices to rise, they behave in ways that make it happen. Workers demand higher wages, businesses raise prices preemptively, and the expectation becomes self-fulfilling. This is why the Federal Reserve monitors inflation expectations closely and why central bankers talk about "anchoring" expectations [Federal Reserve Board, Summary of Economic Projections].

Inflation Is Not Uniform

A critical point that headline inflation numbers obscure: different categories inflate at vastly different rates.

From 2000 to 2024 (approximate figures based on BLS CPI component data):

Overall CPI: roughly doubled
College tuition: more than doubled
Healthcare: increased by roughly 120%
Housing (shelter component): increased by roughly 110%
Technology (computers, electronics): decreased significantly

[Bureau of Labor Statistics, CPI component data, 2000-2024]

This means the "3% average" is misleading if your spending is concentrated in categories that inflate faster. Retirees, for example, spend disproportionately on healthcare, which has historically inflated at 5-6% annually. Their effective inflation rate is higher than the headline number.

Common Mistakes

Mistake 1: Ignoring inflation entirely

Many people set financial goals in today's dollars and never adjust. "I need $1 million to retire" is a statement that loses meaning every year. $1 million in 2024 and $1 million in 2044 are very different amounts of purchasing power. Financial targets should be expressed in real (inflation-adjusted) terms, or recalculated periodically.

Mistake 2: Treating cash as "safe"

Cash and low-yield savings accounts feel safe because the number does not go down. But in real terms, they lose value every year inflation exceeds the interest rate. During 2021-2023, when savings accounts paid 0.1-0.5% and inflation ran 5-9%, cash holders lost significant purchasing power. Keeping an emergency fund in cash is prudent. Keeping your entire net worth in cash is a certain loss to inflation over time.

Mistake 3: Using the wrong inflation rate for planning

Using the long-term average of 3% for all planning is convenient but potentially misleading. If your retirement is heavy on healthcare costs, 3% understates your reality. If you are saving for a child's college education, the relevant inflation rate for tuition has historically been closer to 5-6%. Use category-specific inflation rates when the stakes are high enough to warrant it.

Mistake 4: Confusing temporary spikes with permanent shifts

The 2022 inflation spike caused widespread panic. Some people made drastic financial decisions based on the assumption that 8-9% inflation was the new normal. Within two years, inflation had fallen significantly. Long-term financial planning should use long-term averages (with appropriate stress testing), not react to any single year.

What This Means for You

Inflation is not something you can avoid. It is the background condition of every financial decision you make. The question is whether your money is growing faster than inflation is eroding it.

Historically, broadly diversified stock portfolios have outpaced inflation over long periods. Bonds have roughly kept pace, sometimes slightly ahead, sometimes behind. Cash and savings accounts have typically failed to keep pace with inflation over long periods, though there have been exceptions when yields were unusually high.

This does not mean you should put everything in stocks. It means that every dollar you invest or save should be evaluated against the question: "Is this growing faster than inflation?" If the answer is no, that dollar is losing real value every day, even though the number on the screen stays the same or grows slowly.

Understanding inflation also means understanding that the financial targets you set today will need to grow over time. A retirement plan, a college savings goal, or a down payment target is a moving number, not a fixed one. The earlier you account for this, the fewer surprises you will face.

Key Takeaways

Inflation erodes purchasing power even when your account balance stays the same or grows. At 3% annual inflation, $1 million loses nearly 60% of its real value over 30 years.
Real returns (after inflation) are what matter, not nominal returns. An 8% portfolio return with 3% inflation is a 5% real gain.
Inflation is not uniform. Healthcare, education, and housing have historically inflated much faster than the headline average. Your personal inflation rate depends on what you spend money on.
Cash is not safe in real terms. Over long periods, low-yield cash holdings are a certain loss of purchasing power.
Financial targets should be set and regularly updated in real (inflation-adjusted) terms.

Try the Inflation Calculator to see how this applies to your situation.

MyAvere provides tools and education, not investment advice. Always consult a qualified financial professional for personalized guidance.

References

Bureau of Labor Statistics. Consumer Price Index data and methodology. https://www.bls.gov/cpi/
Federal Reserve Bank of Minneapolis. Historical CPI data series. https://www.minneapolisfed.org/about-us/monetary-policy/inflation-calculator/consumer-price-index-1913-
Federal Reserve Economic Data (FRED). Federal Reserve Bank of St. Louis. https://fred.stlouisfed.org/
Federal Reserve Board. Summary of Economic Projections. https://www.federalreserve.gov/monetarypolicy/fomcprojtabl20240612.htm
Ibbotson Associates (Morningstar). Stocks, Bonds, Bills, and Inflation (SBBI) Yearbook, historical data. https://www.morningstar.com/products/sbbi