Mental accounting

We split money into separate mental accounts, like leisure or home, and don’t treat all money the same.

What problem it addresses

It explains why we spend differently depending on where the money comes from or which mental account we log it in.

You are going to see a play and the ticket costs $10. When you arrive, you find you have lost something.

You lose a $10 bill

Do you buy the ticket anyway? Yes, 88%.

You lose the $10 ticket

Do you buy another? Yes, only 46%.

In both cases you lose $10. But the lost ticket comes out of the theater account, and buying another feels like paying twice.

We log each expense in a mental account, such as leisure, food or treats.
Each account has its own limit, even though the money is the same.
What comes out of an account already spent hurts more than what comes out of another.

Use it like this
Help people see the total cost, not just the account they log it in.
Avoid
Splitting a price into small installments so it doesn’t look like a big expense.
Don’t fall for it
Before spending, ask yourself whether you would do it with money from another account.

88% vs 46%

People who would buy the ticket after losing a $10 bill or after losing the ticket itself (Tversky and Kahneman, 1981).

Solid evidence. Thaler (1985) developed the idea and called it mental accounting.

Thaler, R. (1985). Mental accounting and consumer choice. Marketing Science, 4(3), 199–214. View source: Thaler, R. (1985)
Tversky, A., & Kahneman, D. (1981). The framing of decisions and the psychology of choice. Science, 211(4481), 453–458. View source: Tversky, A., & Kahneman, D. (1981)

Last reviewed: October 25, 2026