What is the IKEA effect?

The tendency to overvalue things you partly made yourself — the effort you invested inflates your sense of the result’s worth, regardless of its objective quality.

What’s an example of the IKEA effect?

Cake mixes sold better once they required adding a real egg: the small effort created ownership, making bakers value the result more.

How does the IKEA effect mislead founders?

It inflates how they value their own product or startup, making honest outside feedback hard to accept because the invisible effort feels like part of the worth.

The IKEA effect

Valuation

The IKEA effect is the tendency to place disproportionately high value on things we partly made ourselves. The labour we put in inflates our sense of worth — a wobbly self-assembled shelf can feel more valuable than a sturdier store-bought one.

Why it happens

Effort creates attachment and signals competence, and we justify the work by valuing its result. Our own contribution looms large in how we appraise the outcome.

Examples

Valuing self-built furniture, gardens, or code above objectively better alternatives.
Founders overvaluing their own product or startup.
Cake mixes selling better when they require adding a real egg — a little effort creates ownership.

How to counter it

Separate the value of your effort from the value of the result.
Get an outsider’s appraisal, free of your sweat-equity.
Ask whether you’d pay the same price if someone else had made it.

The deeper point

It’s why feedback on your own work is so hard to hear: the effort that built it is invisible to everyone else but enormous to you. The market prices the result; you price the result plus your labour, and the gap feels like injustice.

Frequently asked

What is the IKEA effect?: The tendency to overvalue things you partly made yourself — the effort you invested inflates your sense of the result’s worth, regardless of its objective quality.
What’s an example of the IKEA effect?: Cake mixes sold better once they required adding a real egg: the small effort created ownership, making bakers value the result more.
How does the IKEA effect mislead founders?: It inflates how they value their own product or startup, making honest outside feedback hard to accept because the invisible effort feels like part of the worth.

Sunk-cost fallacy Loss aversion The map is not the territory Opportunity cost

Editorial synthesis © ReadGlobe 2026, drawing on Kahneman’s Thinking, Fast and Slow, the Tversky–Kahneman research program, and the primary cognitive-science literature. · Last reviewed 2026-05-29.