Money Illusion

02What People Think

"The number is bigger, so I must be better off."

03What’s Underneath

Nominal money is the amount printed on a payslip or account statement. Real value asks what that amount can buy. If pay rises by 2 percent while the prices relevant to your spending rise by 5 percent, the larger paycheck buys less of the same basket. Money illusion is giving the headline increase too much weight.

The same issue can appear when comparing a sale price with a purchase price from years earlier. A larger number received later may not represent a gain in purchasing power. The arithmetic can be especially easy to miss when the nominal change sounds favorable and everyday price changes arrive separately, one bill at a time.

This does not mean nominal amounts are irrelevant. A debt or rent payment fixed in currency still has to be paid in that amount. Personal spending patterns also differ from a broad inflation index. The useful distinction is between recognizing the cash numbers that govern a transaction and mistaking them for a complete measure of improvement.

04The Game

When comparing money across time, what happened to the price of the things that money needs to buy? Keep the time period and comparison basket clear. A higher number can be good news while still representing less purchasing power than you expected.