# Money Illusion: Why a 5% Raise in 8% Inflation Is Actually a Pay Cut
The money illusion is the tendency to think about money in nominal (face value) terms rather than real (inflation-adjusted) terms. Irving Fisher named it in 1928; decades of research have confirmed it persists even among economically sophisticated individuals.
The practical consequence: people evaluate raises, investment returns, and prices in dollar amounts rather than purchasing power — systematically misreading their financial situation.
The raise that isn't a raise
A 5% salary increase feels like a win. In an 8% inflation environment, purchasing power declined by approximately 3%. The $5,000 additional salary buys $3,000 less worth of goods and services than the previous year's income bought.
Survey research by Shafir, Diamond, and Tversky asked people to evaluate workers in different scenarios. When told a worker received a 5% nominal raise during 8% inflation, respondents rated that worker as "better off" even though real purchasing power declined more steeply than a scenario with a smaller nominal raise in lower inflation.
People are aware of inflation abstractly but fail to apply it consistently in their real-time assessments.
Investment return misreading
A savings account yielding 5% feels like a good return. In a 5% inflation environment, the real return is approximately zero — purchasing power is flat. In 2022, when inflation exceeded 8%, savings accounts at 1% were destroying real wealth at 7% annually, even though they felt "safe" because the nominal balance was stable or growing.
The distinction matters most for long-term planning: a 7% nominal portfolio return with 3% inflation produces a 4% real return — the amount available for increased consumption. A 10% nominal return with 8% inflation produces only 2% real return.
**Where money illusion shows up most expensively:** Long-term fixed contracts (rent, salary agreements, fixed-rate loans all interact with inflation); retirement savings targets (many people target a nominal number like "$1 million" without considering that $1 million in 30 years has roughly 40–50% of today's purchasing power).
Interactive Model
Nominal vs. Real Returns — Money Illusion Calculator
See the gap between how money looks (nominal) and what it buys (real) — across raises, investment returns, and purchasing power.
Investment returns
Salary raises
Real return approximation: (1+nominal)/(1+inflation) − 1. Exact Fisher equation. For retirement planning, use real returns and real spending targets rather than nominal projections. BLS CPI Calculator available at bls.gov for historical inflation adjustments.
Thinking in real terms
The correction requires a deliberate habit: always convert nominal figures to real ones before making judgments.
- When evaluating a raise: subtract current inflation from the nominal percentage
- When evaluating investment returns: subtract inflation from nominal returns
- When setting retirement targets: use a real dollar target in today's purchasing power
- When evaluating historical comparisons: use the Bureau of Labor Statistics CPI Inflation Calculator
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*Related: [Inflation erosion in retirement](./inflation-erosion-retirement) — the long-run math of real vs. nominal returns. [Mental accounting](./mental-accounting) — money illusion operates through nominal mental accounting.*