Imagine that you spend your entire weekend building a bookshelf all on your own. It is not totally perfect; perhaps it is a little lopsided and one of the shelves was not quite in place correctly. You would still prefer your own shelf to a sturdier factory-made shelf because your imperfect shelf is built by you. Economists have a name for this irrational little act. The IKEA effect is the tendency to overvalue what we make ourselves. It sounds like a quirk of furniture making, but really, it is a theory of how we assign value to almost everything and how we decide what to love based on effort, not on quality.
The IKEA effect isn’t just a nice observation about furniture; it is a documented pattern. The name comes from a set of experiments by behaviour scientists Michael Norton, Daniel Mochon, and Dan Ariely in 2012, who attempted to test if the simple act of building something changes the amount you value it. In their studies, people assembled blank IKEA storage boxes, folded origami and put together sets of Legos. Afterwards, they were asked how much the objects they created were worth. The results were shocking: The people placed almost the same value on their own lopsided origami as the ones that were professionally folded and expected other strangers to admire them just as much. They had created amateur work objectively, but subjectively they had produced something precious.
A meta-analysis of 55 studies with over 5000 participants conducted in 2025 confirmed that the effect is real, and moderate in size, holding up across different types of tasks and products. That is: the sentimental value for your wobbly shelf is not a personal ‘feeling’; it is remarkably and reliably human.
The puzzle
Standard economic thinking assumes that we value products based on value, usefulness and what another person would pay for them. If a shelf is just a shelf, then obviously a well-made one should be worth more than an imperfect one, right? Yet, the IKEA effect says otherwise. The same object becomes more valuable the moment our own hands work on it simply because the effort was ours to begin with. This overlaps with the endowment effect, where just owning something makes us value it more (Kahneman, Knetsch & Thaler, 1990). So, the difference is that the endowment effect only comes from possession, whereas the IKEA effect requires one’s own effort. So, you would have to build the shelf by yourself, not just own it.
Underlying process debate
So why does it happen? Researchers largely agree that the effect is real but disagree about what drives it. There are three explanations, and the tension between them is what makes the IKEA effect more interesting.
The first explanation is justification. We are reluctant to believe that our effort was wasted, so we convince ourselves that the result was worth it. This idea is deeply rooted in decade-old psychological phenomena. Psychologists Elliot Aronson and Judson Mills found that people who endured a painfully embarrassing initiation to get into a group later rated that group as more attractive than those who got in easily. Essentially, the mind protects its own labour. By this logic, the wobbly shelf must be valuable; otherwise, what was the whole exhausting afternoon for?
The second explanation is more flattering. Building something is proof that we can. Psychologists call it a need for competence: the satisfying sense that we can act on the world and produce a result. When you have finished assembling the shelf, you have not just gained a shelf; you have proved that you are capable. Follow-up work by the same researchers found that when people’s sense of competence was threatened, the IKEA effect grew stronger, as if building something was a way of reassuring ourselves. In other words, building things could be a way of repairing a bruised sense of our own capability.
The third point is ownership. Labour blurs the line between the object and the shelf; the hours you have poured in become part of the shelf, so to value it more is really a way to value yourself. It stops being furniture and starts to become an extension.
These accounts are not rivals but overlapping truths, and no single study has cleanly separated them. Perhaps that is the honest answer. We overvalue what we built because it spares our pride, proves our competence, and becomes a piece of us. Sometimes all at once, much like the optimism bias, where we tilt our judgement in our own favour.
The catch
There is a huge catch that saves the whole idea from simply being “the more you struggle, the more you love.” In their experiments, Norton and his colleagues found that the effect appeared only when people completed what they were building, when participants assembled something and then got a part or when they stopped before they could finish. The extra affection vanished since half-built shelves only caused irritation. It isn’t effort itself we fall in love with; it is the effort brought to completion. What we truly value is the moment of finishing: the proof that we set out to make something and actually pulled it off. Unfinished, it is just labour. Finished, it becomes a small private victory, and it is the victory, not the sweat, that we cherish.
The age of effortlessness
All of this assumes that effort is something we spend, but we are entering an age designed to remove it. Meal kits arrive with the vegetables already chopped. Flatpack furniture is giving way to ‘some assembly already done.’ And now artificial intelligence, growing more capable by the day. It can write essays, compose songs, and generate images in seconds. No Sunday afternoon spent working. There would be no effort that you can be quietly proud of. It removes the feeling of having earned the result. When the machine does the building, there is no completion to savour. Yes, the product arrives, but the quiet price of making it never does.
If the IKEA effect truly works, this should worry us a little. The attachment we feel to our work is not free. It is bought with effort and sealed by completion to strip out the labour and even love itself along with it. A dinner you assembled from a kit feels more like yours than one delivered to your door. A report that you honestly wrote feels more like yours than one a machine produced while you watched. As tools grow more capable, we gain speed and polish but risk losing the very friction that made our creations feel meaningful. The IKEA effect leaves us with an urgent question that hides in the dark. If we no longer do labour, will we still love what we make? I suspect we will adapt, inventing new frictions to feel ownership again, but the risk of hollow, effortless creation is real. And it is likely to phase in quietly, one convenience at a time, each trimming a little more effort, until we no longer feel much about the things we ‘make’ at all.
The final reflection
So return to that leaning bookshelf. Nothing about it has changed; it is still imperfect and still less sturdy than the factory-made one you turned down. But now you understand why you keep it anyway. It carries your whole afternoon inside it, the effort, the small frustrations, the quiet satisfaction of a job well done. That is what you are really refusing to trade.
At first, the IKEA effect looks like a harmless bias about furniture, but when we look closer, it reveals something gentler and more human. We do not value things only for what they are, but for what we put into them. Effort is a kind of authorship, and we love what we author. The wobble was never the point. The building was.
References
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. https://doi.org/10.1037/h0047195
Festinger, L. (1957). A theory of cognitive dissonance. Stanford University Press.
Kahneman, D., Knetsch, J. L., & Thaler, R. H. (1990). Experimental tests of the endowment effect and the Coase theorem. Journal of Political Economy, 98(6), 1325–1348. https://doi.org/10.1086/261737
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. https://doi.org/10.1016/j.ijresmar.2012.05.001
Norton, M. I., Mochon, D., & Ariely, D. (2012). The IKEA effect: When labour leads to love. Journal of Consumer Psychology, 22(3), 453–460. https://doi.org/10.1016/j.jcps.2011.08.002
Pelled, A., Demetriades, S. Z., & Walter, N. (2025). Labour leads to love, right? A meta-analysis of the IKEA effect. Psychology & Marketing, 43(2), 388–400. https://doi.org/10.1002/mar.70064
