The IKEA Effect: Why We Fall in Love With Things We Struggle to Build

You spend forty frustrating minutes with an Allen key, half-labelled instructions, and a bag of mismatched screws, and somehow, by the end of it, you love that wobbly bookshelf more than almost anything else in the room. Not because it’s well made. Often it’s objectively worse than something you could have bought pre-assembled. You love it because you built it, and psychologists have spent real research time proving that this reaction isn’t just sentimentality, it’s a measurable, predictable bias.

The Study That Gave It a Name

In 2011, researchers Michael Norton of Harvard Business School, Daniel Mochon, and behavioural economist Dan Ariely ran a series of experiments specifically designed to test this instinct. Participants assembled IKEA storage boxes, folded origami, and built small Lego sets, then were asked to put a price on their own creations.

The results were strikingly consistent. As the researchers put it themselves:

“Participants saw their amateurish creations as similar in value to experts’ creations, and expected others to share their opinions.”

People weren’t just fond of what they’d built, they genuinely believed strangers would value it roughly as highly as a professionally made version, despite the obvious, often wobbly evidence to the contrary sitting right in front of them.

It Only Works If You Actually Finish It

One of the more interesting findings from the study wasn’t just that effort increased value, it was discovering exactly when that effect disappeared. In follow-up experiments, some participants built their creations and then had them taken apart or destroyed before they could evaluate them. In those cases, the usual boost in perceived value vanished entirely.

The researchers were direct about what this meant:

“Labor leads to love only when labor results in successful completion of tasks.”

A half-finished or undone project doesn’t earn the same emotional investment as a completed one, even if roughly the same amount of effort went into it. Completion, not just effort, turned out to be the actual trigger.

Novices Fall for It Just as Hard as Hobbyists

You might assume this effect is strongest among people who genuinely enjoy building things, the committed “do-it-yourself” crowd who’d proudly display a slightly crooked shelf regardless. The research found otherwise. According to the study’s own conclusions, labor increased valuation for both committed hobbyists and people with no particular interest in building anything at all. The bias wasn’t a quirk of hobbyist identity, it appeared to be a far more universal response to simply putting in the work.

The Cake Mix That Needed One More Step

Long before Norton, Mochon, and Ariely ever named the effect, product designers had already stumbled onto a version of it by accident. In the 1950s, instant cake mix companies ran into a strange problem: their mixes, designed to require nothing but water, weren’t selling the way executives expected.

The widely cited explanation, drawn from marketing research at the time, points to a surprisingly small fix. When manufacturers changed the recipe to require the baker to crack and add a real egg themselves, rather than relying entirely on powdered egg already in the mix, sales improved. Adding back one small, hands-on task appears to have made bakers feel like they were actually contributing something to the cake, rather than simply pouring and stirring a shortcut. As one product strategist summarising the story put it:

“Instant cake mixes became too easy, so they tweaked the process, you had to add an egg, and satisfaction went up.”

Why the Effect Even Exists

Researchers point to a few overlapping psychological mechanisms behind the IKEA effect. One is a sense of competence, the specific satisfaction of successfully completing a task with your own hands, which boosts how much value you assign to the result. Norton and his colleagues also drew a direct line back to earlier psychological research on “effort justification,” including a well known 1959 study by Elliot Aronson and Judson Mills, which found that people who endured a more difficult or uncomfortable initiation process into a group ended up valuing their membership in that group more highly afterward, purely because of what it had cost them to get in.

Put simply, the harder something is to obtain or build, the more our minds seem determined to justify that effort by deciding the result must have been worth it.

It Doesn’t Stay in the Workshop

What makes the IKEA effect genuinely useful to understand is that it reaches far beyond flat-pack furniture. The same Wikipedia entry on the effect notes that it’s considered a contributing factor to the sunk cost effect, the well documented tendency for managers to keep pouring resources into a failing project simply because they’ve already invested significant labor into it, rather than cutting losses based on the project’s actual merit.

It shows up in relationships too, in the sense that people often feel more attached to things, plans, or even connections they had to work hard to build or repair, regardless of whether that attachment is actually warranted by the end result. The feeling of “I put so much into this” quietly does a lot of work in convincing us something deserves to be valued, kept, or defended, whether that something is a bookshelf, a business plan, or a relationship that’s cost far more effort than it’s returned.

Suggested Reading

• The Diderot Effect: Why One New Thing Always Leads to Five More
• Why We Keep Buying Things to Become a Different Person