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.

By the ReadGlobe Editors · Reviewed 2026-05-29

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.

The market prices the result; you price the result plus your labour, and the gap feels like injustice.

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

Keep reading

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Mental modelSystems thinking Mental modelIncentives Mental modelExpected value

Where it’s shows up in

See this alongside the other thinking tools of product management and software engineers.

Where it bites

This bias distorts product decisions and shopping & spending.

The books behind better thinking

Listen to any of these free. Start a free Audible trial and get your first audiobook on the house.

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Prefer to read? The canonical picks:

Thinking, Fast and Slow — Daniel Kahneman
The Art of Thinking Clearly — Rolf Dobelli
The Great Mental Models, Volume 1 — Shane Parrish
Poor Charlie’s Almanack — Charlie Munger
Super Thinking — Gabriel Weinberg & Lauren McCann
Seeking Wisdom — Peter Bevelin

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Cite this page

APA

ReadGlobe. (2026). The IKEA effect. https://readglobe.com/bias/ikea-effect/

MLA

"The IKEA effect." ReadGlobe, 29 May 2026, readglobe.com/bias/ikea-effect/.

Primary source: Wikipedia

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.