Money Illusion: Why Your 5% Raise Might Really Be a Pay Cut
Here’s a myth almost everyone carries around: a dollar is a dollar. If your salary goes up 5%, you got a 5% raise. If your house sells for 30% more than you paid, you made 30%. It feels self-evidently true — and it’s exactly the mistake economists call money illusion: judging money by its face value instead of its purchasing power. Irving Fisher wrote an entire book about it in 1928, and nearly a century later it still quietly distorts how people evaluate raises, savings accounts, home sales, and investment returns. In this post you’ll see the research showing how money illusion works, four everyday places it costs real money, and a simple three-step audit to strip it out of your own numbers.
The belief: “my balance went up, so I’m better off”
The myth has intuitive appeal because nominal numbers are the only ones we ever see. Your paystub shows nominal dollars. Your brokerage app shows nominal gains. Zillow shows nominal price history. Nobody sends you a statement denominated in purchasing power.
So the default belief becomes: bigger number, better outcome. A 5% raise is a win. A savings account paying 4% is “finally earning something.” A house that went from $300,000 to $390,000 “made” $90,000. None of these claims is necessarily true, because each one ignores what happened to prices over the same period.
The scale of the gap is bigger than most people intuit. Based on Bureau of Labor Statistics CPI-U data, average consumer prices rose roughly 23% between 2019 and 2024 (annual averages). That means a salary, account balance, or price that grew less than about 23% over those five years lost purchasing power — even though every monthly statement along the way showed the number going up.
What money illusion actually is — and the research behind it
Money illusion is the tendency to think in nominal rather than real (inflation-adjusted) terms. Fisher named it in his 1928 book The Money Illusion, but the cleanest modern evidence comes from a 1997 study by Eldar Shafir, Peter Diamond, and Amos Tversky published in the Quarterly Journal of Economics.
In one of their scenarios, participants compared two people: Ann, who received a 2% raise in a year with no inflation, and Barbara, who received a 5% raise in a year with 4% inflation. Do the arithmetic and Ann is clearly ahead — her real raise is 2%, Barbara’s is roughly 1%. When participants were asked who was better off economically, most correctly picked Ann. But when asked who was happier, a majority picked Barbara. The bigger nominal number won the emotional contest even among people who could do the math.
A related 1986 study by Daniel Kahneman, Jack Knetsch, and Richard Thaler in the American Economic Review found the same asymmetry in how people judge fairness: 62% of respondents called it unfair for a company to cut wages 7% during a period of no inflation, but 78% found it acceptable for a company to grant a 5% raise during 12% inflation. The second scenario is the same 7% real pay cut — it just doesn’t look like one.
This is why money illusion is so durable. It isn’t ignorance of inflation; it’s that nominal framing dominates our gut reaction even when we know better. It’s a close cousin of the framing effect in pricing psychology — the same quantity, presented two ways, produces two different feelings.
Where money illusion costs you: four everyday examples
Here’s how the nominal-versus-real gap plays out in the places most people encounter it. The scenarios below assume 3% inflation, close to recent U.S. experience (the Federal Reserve targets 2%; CPI has run above that for much of this decade).
| Situation | Nominal (what you see) | Real (what you got, at 3% inflation) |
|---|---|---|
| Annual raise of 4.5% | +4.5% | ≈ +1.5% |
| High-yield savings at 4.2% APY | +4.2% | ≈ +1.2% (before taxes) |
| Cash in a checking account at 0% | 0% | ≈ −3% every year |
| Home bought for $300k (2015), sold for $390k (2024) | +30% “gain” | ≈ −2% real (CPI rose ~32% over 2015–2024) |
Raises. The clearest recent example: in December 2022, average hourly earnings were up 4.6% year over year while CPI was up 6.5%, per BLS data. Millions of workers got what looked like the best raise of their careers and took a real pay cut of nearly 2%. If you only compare this year’s salary to last year’s, you’ll never see it.
Savings accounts. A 4% APY feels dramatically better than the near-zero rates of the 2010s. But what matters is the gap between your yield and inflation, and that gap is usually 1–2 percentage points at best — before taxes on the interest. Savings accounts preserve purchasing power; they rarely build it.
Home prices. “We bought for $300k and sold for $390k” is a 30% nominal gain, but BLS CPI-U annual averages rose about 32% from 2015 to 2024. The sellers in that scenario roughly broke even in real terms — and that’s before transaction costs, property taxes, insurance, and maintenance. Money illusion is one reason homeowners consistently overestimate what their house “made them,” and it compounds badly with anchoring bias when buying a house, where the first nominal number you see sets your whole frame.
Long horizons. Small annual gaps become enormous over decades. At 3% inflation, the rule of 72 says purchasing power halves roughly every 24 years. A retiree who keeps a fixed nominal income from 65 to 89 will watch its real value fall by about half — while the dollar amount on the statement never changes.
Why the myth survives even when you know the math
Three reinforcing reasons. First, nominal numbers are salient and real numbers are invisible — you’d have to compute them yourself. Second, inflation arrives in tiny daily increments while raises and account statements arrive as discrete, celebratable events. That’s the same asymmetry that makes hedonic adaptation and lifestyle inflation so hard to notice: gradual changes escape attention. Third, we mentally file money into labeled buckets and judge each bucket by its own nominal score — the same habit behind mental accounting with tax refunds, where dollars get treated differently depending on the label rather than the value.
I ran into my own version of this a few years back. As a software engineer I keep a spreadsheet tracking my index fund portfolio, and out of curiosity I added one column: each year-end balance deflated by CPI. The honest result was uncomfortable — a couple of years I had mentally filed as “solid gains” were close to flat in real terms, and one “flat” year was a real loss. Nothing about my strategy changed, but the real column permanently changed which years I consider good ones. It cost ten minutes to build and it’s the cheapest de-biasing tool I own.
What to do instead: a three-step real-terms audit
Step 1: Restate your raise. The quick version: real raise ≈ nominal raise minus inflation. (The precise formula is (1 + nominal) ÷ (1 + inflation) − 1, which matters at high inflation rates.) Use the trailing 12-month CPI figure from BLS.gov, which is updated monthly. If your raise trails CPI, you now have a concrete, unemotional case to bring to a compensation conversation.
Step 2: Restate your cash. For every account, write down yield minus inflation. Checking at 0% is roughly −3% real; a HYSA at 4.2% is about +1.2% real before taxes. This single exercise usually resizes emergency funds sensibly: enough real-losing cash for genuine emergencies, and not a dollar more.
Step 3: Restate your long-term returns. When you evaluate your portfolio — or any investment pitch — ask for the real number. Vanguard’s long-run research and virtually all academic finance uses real returns for exactly this reason; a “10% average” market return in a 3% inflation world is a 7% real return, and that’s the number that determines what you can actually buy in retirement. Judging recent nominal performance also feeds directly into recency bias in investing — hot nominal years look even hotter when you forget the inflation running underneath them.
Want to see what your savings will really be worth after inflation?
One caution in the other direction: money illusion cuts both ways. Nominal thinking makes gains look better than they are, but it also makes market drops feel worse than they are during high-inflation periods — and it makes fixed-rate debt look scarier than it is, since inflation quietly erodes the real burden of a fixed mortgage payment. The goal isn’t pessimism; it’s accuracy.
Frequently asked questions
Is money illusion the same thing as inflation?
No. Inflation is the economic fact — the general rise in prices over time. Money illusion is the cognitive bias: evaluating money in nominal terms without adjusting for that fact. Inflation happens to everyone; money illusion is optional, and the whole point of thinking in real terms is to opt out.
How do I calculate my real raise?
Divide (1 + your raise) by (1 + inflation) and subtract 1. Example: a 4% raise with 3% inflation is 1.04 ÷ 1.03 − 1 ≈ 0.97%, so just under a 1% real raise. For quick mental math, nominal minus inflation is close enough at typical U.S. inflation rates. Use the latest 12-month CPI change published by the Bureau of Labor Statistics.
Does money illusion affect investors, or just people evaluating salaries?
Investors may be affected most. Nominal framing inflates how good past market returns feel, makes cash yields look more attractive than their real value, overstates home price appreciation, and understates the long-run damage of holding uninvested cash. Academic research on money illusion, including the 1997 Shafir, Diamond, and Tversky study, found it operates in market contexts as well as wage contexts.
Photo by Alexander Grey on
Unsplash
