Money illusion
Judging money by its face value rather than its real purchasing power.
What it means
Money illusion is the tendency to think about and respond to money in nominal terms — its face value — rather than in real, inflation-adjusted terms that reflect actual purchasing power. The mechanism is a framing effect: nominal figures are the salient, easily processed representation in which prices, wages, and balances are quoted, so people anchor on them and underweight the corrosive effect of inflation, which requires an extra deflationary calculation that is rarely performed. Shafir, Diamond, and Tversky demonstrated that people's judgments of fairness, satisfaction, and well-being depend on whether a change is described in nominal or real terms, even when the real outcomes are identical. The illusion has important macroeconomic consequences emphasized by economists from Fisher onward: it underlies resistance to nominal wage cuts (which feels worse than an equivalent real cut delivered via inflation), helps explain the short-run real effects of monetary policy, and distorts saving, borrowing, and investment decisions. It matters because so much of economic life is denominated in nominal units, and the gap between nominal and real systematically biases how people perceive raises, returns, debts, and prices.
Examples
A 2% raise during 4% inflation feels like a gain and is received with satisfaction, even though purchasing power has actually fallen by roughly 2%.
Homeowners boast of selling for double what they paid two decades earlier, forgetting that most other prices doubled too — in real terms the house barely gained a thing.
A saver leaves cash in an account paying one percent and feels she is earning; with inflation at three, the balance grows every year while the shopping it buys shrinks.
First described in Irving Fisher; Shafir, Diamond & Tversky (1997).