IKEA Effect
Edited by Paweł Raja, PhD · Published
Definition
IKEA Effect is the IKEA effect is the tendency to place a disproportionately high value on things we have made or assembled ourselves, even when the result is no better than — or worse than — an equivalent product made by someone else.
- Category:
- Decision Architecture
- Impact:
- Medium
- Landmark study:
- Norton et al. (2012)
- Evidence here:
- 4 cited studies
Why it happens: the psychology of ikea effect
Michael Norton, Daniel Mochon and Dan Ariely named the effect in 2012 after the Swedish furniture retailer whose customers assemble their own products. In a series of studies in which participants assembled IKEA boxes, folded origami and built Lego sets, people valued what they had made more than they valued comparable products they had not made. They saw their amateurish creations as similar in value to experts' work and expected other people to share that opinion.
Labor leads to love only when the labor succeeds. When participants built something and then had it taken apart, or failed to complete it, the extra valuation disappeared. The effect also appeared among people who said they had little interest in do-it-yourself projects, so it is not merely a hobbyist's pride.
Mochon, Norton and Ariely (2012) traced the effect to feelings of competence. Making something successfully signals to ourselves and others that we are capable, and those feelings of competence explained the higher valuation. Affirming people's sense of self beforehand reduced the value they placed on their creations, while threatening it made them more eager to make things themselves.
The IKEA effect belongs to a family of biases in which our own involvement inflates value. The endowment effect raises the value of what we own; effort justification raises the value of what we suffered for, as in Aronson and Mills's (1959) finding that a harder initiation made a dull group seem more attractive. In mass customization, Franke, Schreier and Kaiser (2010) found an 'I designed it myself' effect: self-designed products commanded a higher willingness to pay, explained by feelings of accomplishment. Inside organizations, the same pull underlies the not-invented-here syndrome and can feed the sunk cost fallacy.
IKEA Effect examples
In experiments by Norton, Mochon and Ariely (2012), people who assembled IKEA storage boxes, folded origami or built Lego sets valued their own creations more highly than comparable products they had not made, rated their amateur work as similar in value to experts' creations, and expected others to agree.
- Preferring the slightly wobbly bookshelf you assembled yourself to a sturdier ready-made one that costs the same.
- Setting an asking price for a car you restored or a home you renovated that is well above what the market will pay.
- A team defends its in-house software tool long after a better off-the-shelf alternative appears, because 'we built it' — the not-invented-here syndrome.
- Users who spent hours customizing an app's dashboards, playlists or layout are reluctant to switch to a competitor, even a better one.
- Sticking more readily with an exercise or budget plan you drafted yourself than with one handed to you — a useful side of the effect.
- Overrating your own drafts, code or slide decks relative to how colleagues see them.
- Feeling unusual pride in a meal-kit dinner you cooked, compared with a ready meal of similar quality.
The IKEA effect in marketing and product design
Businesses use the effect by inviting a small amount of customer effort: flat-pack assembly, configuring a product online, building a profile or personalizing a workspace. The research points to two conditions. The task has to be completable, because effort that ends in failure removes the benefit, and the customer has to feel the result is their own contribution.
There is a fine line between engagement and friction. Making customers do work that adds nothing to their sense of accomplishment is not the IKEA effect; it is sludge. The story that instant cake mixes sold better once bakers had to add a fresh egg is often told to illustrate the effect, but it is an anecdote rather than evidence.
IKEA effect vs endowment effect
The endowment effect is about ownership: once something is yours, giving it up feels like a loss, so you demand more to part with it. The IKEA effect is about authorship: value grows with the labor you put in, and only when that labor succeeds. The two often occur together — you usually own what you build — but you can own something you did not make, and the IKEA effect specifically tracks your own effort.
How to avoid the ikea effect
- Get an outside valuation. Ask someone who had no hand in the work how good it is or what it is worth, and take their answer seriously.
- Compare against the best alternative, not against nothing. Ask whether you would choose your solution if a colleague or competitor had built it.
- Separate effort from outcome. When reviewing a project, list the hours invested separately from the results achieved, so the first does not inflate the second.
- Check market comparables before pricing anything you made or improved yourself, such as a renovated home, a restored car or your own business.
- Use the effect deliberately. Involving people in building the plan they must follow — a budget, a training schedule, a team process — makes them value it and stick with it.
How to design for it (nudge strategy)
Let people complete a small, achievable part of the work — assembling, customizing or choosing settings — so they value and stick with the result; and when judging your own work, get a valuation from someone who did not build it.
Ethical use: design for choices people would endorse on reflection — a nudge, not sludge. Be transparent and keep opting out easy.
Key studies
People valued products they assembled (IKEA boxes, origami, Lego) more highly, saw them as comparable to experts' work, and the effect vanished when they failed to finish or their creations were destroyed.
Norton, M. I., Mochon, D., & Ariely, D. (2012). The IKEA effect: When labor leads to love. Journal of Consumer Psychology, 22(3), 453–460. DOI →
Feelings of competence from assembling a product explained its higher value; self-affirmation reduced the effect and a threat to the self increased people's desire to make things themselves.
Mochon, D., Norton, M. I., & Ariely, D. (2012). Bolstering and restoring feelings of competence via the IKEA effect. International Journal of Research in Marketing, 29(4), 363–369. DOI →
Across five studies, self-designed products generated higher willingness to pay regardless of preference fit and design effort, an effect mediated by feelings of accomplishment.
Franke, N., Schreier, M., & Kaiser, U. (2010). The "I designed it myself" effect in mass customization. Management Science, 56(1), 125–140. DOI →
People who went through a more severe initiation to join a discussion group rated the group as more attractive — the related phenomenon of effort justification.
Aronson, E., & Mills, J. (1959). The effect of severity of initiation on liking for a group. Journal of Abnormal and Social Psychology, 59(2), 177–181. DOI →
Related biases
IKEA Effect: frequently asked questions
What is the IKEA effect?
The IKEA effect is the tendency to value things more highly because we made or assembled them ourselves, even when they are no better than equivalent products made by others.
Why is it called the IKEA effect?
Norton, Mochon and Ariely named it after IKEA, whose furniture customers assemble themselves; one of their experiments used IKEA storage boxes.
What is an example of the IKEA effect?
Being proud of a self-assembled bookshelf that is less sturdy than a ready-made one, overpricing a home you renovated yourself, or a team sticking with an in-house tool because it built it.
Is the IKEA effect a cognitive bias?
Yes. It systematically inflates the value of our own creations relative to how others see them. It can also be useful, because people who helped build a plan or product tend to value it and stay committed to it.
When does the IKEA effect not happen?
In Norton and colleagues' studies, the extra valuation disappeared when people failed to complete the task or when their creation was destroyed. The labor has to end in success.
How do companies use the IKEA effect?
Through self-assembly, product customization, configurable software and onboarding flows that let users set things up themselves. These create a sense of authorship that raises perceived value and loyalty.
Cite this page
Raja, P. (Ed.). (2026, 8 Oct 2026). IKEA Effect. Behavioral Economics Lab. https://www.behavioraleconomicslab.com/biases/ikea-effect