Everyday money · General financial education

Mental accounting

People sort money into pots: rent, holiday, emergency. That helps with oversight, and can mislead, because every euro is economically interchangeable.

In more detail

Fungibility means origin and label do not change economic value. A holiday pot beside a running overdraft feels “protected” while the expensive credit keeps running. Separate pots can support self-control; they do not wipe interest on the other side.

Background

Mental accounting (Thaler) explains why people spend a windfall unlike a salary, and why a label stops or releases spending. The trap appears when the label hides a dearer option. OECD education uses pots as a technique, and names cases where you deliberately ignore the label, such as savings instead of expensive credit. That is a thinking frame, not product advice.

An example

€400 labelled “holiday” in instant-access savings, €400 overdraft. Economically that is €0 net plus overdraft interest. The label does not change the interest maths.

A common misconception

Money in a named pot is a different kind of money.

Money is interchangeable. A label changes neither overdraft interest nor net wealth.

Source: OECD · Smarter financial education. Last reviewed: 2026-11-09. Editorially reviewed on 2026-11-09. Next review 2027-11-09. Version 0.2.0. Finmon explains. It does not advise. Not investment, tax or legal advice.