The moment you own something, it becomes worth more to you

Richard Thaler named this pattern in 1980 and called it the endowment effect. The mechanism is straightforward and has been replicated across hundreds of experiments: people demand significantly more to give up something they own than they would pay to acquire the identical thing. In the foundational experiment by Kahneman, Knetsch, and Thaler, participants given a mug consistently valued it at roughly twice what buyers would pay for the same mug. Ownership itself — independent of any rational argument — shifts perceived value upward.

The underlying mechanism is loss aversion, established in Kahneman and Tversky’s prospect theory research. The psychological pain of giving something up is greater than the psychological pleasure of acquiring it. This asymmetry is not a personality trait or an error in reasoning. It is a consistent, documented feature of how the human mind evaluates losses relative to gains — and it activates the moment ownership begins.

For entrepreneurs, the implications are significant and specific. The moment a business belongs to someone, they are psychologically positioned as a seller. And the endowment effect ensures that their minimum acceptable price will exceed what any buyer considers fair value by a predictable, systematic margin — before a single negotiation has begun.

Why the gap is wider for businesses than for mugs

In the original mug experiments, participants had owned the mug for minutes. An entrepreneur may have owned their business for a decade. The endowment effect strengthens with time, effort, and personal investment — and a business typically carries all three at maximum intensity.

Research on what Norton, Mochon, and Ariely called the IKEA effect established that the effort invested in building something amplifies ownership-based overvaluation beyond simple possession. Participants who assembled furniture themselves valued the finished product significantly more than those who received it pre-assembled. A founder who has built a company from nothing experiences this effect at its most extreme. The years of work, the sacrifices made, the problems solved — none of these are valuation inputs in any financial model. But they are all present in the entrepreneur’s psychological experience of what the business is worth.

Loss aversion compounds this further. Selling a business is not simply a financial transaction for most entrepreneurs. It is the simultaneous loss of an identity, a daily structure, a social role, and frequently the majority of their net worth. Research on business exits consistently finds that a business owner’s company represents 80 to 90 percent of their total wealth. Each of these additional loss dimensions adds to the subjective cost of selling — pushing the minimum acceptable price further from what the market will pay.

The anchor that was never calibrated to reality

Anchoring bias provides the third mechanism, and in practice it is where the valuation gap becomes most entrenched. Research including Tan et al.’s 2020 study in the Journal of Behavioral Finance found that anchoring effects persist even among expert valuators — when a high initial figure is provided, valuations are higher; when a low figure is provided, valuations are lower. Adjustments from a starting point are almost always insufficient.

For entrepreneurs, the starting point is often generated not from the business’s actual financial performance but from personal financial need. Many owners calculate what they need to retire comfortably, pay off existing obligations, and fund the next chapter — then set that figure as the asking price. The anchor was never derived from the market. It was derived from personal circumstance. And once established, it is highly resistant to revision because every subsequent conversation about price involves adjusting downward from a number the entrepreneur generated and now implicitly owns.

Confirmation bias maintains the anchor: competitor sales that seem high are noticed and remembered; lowball offers are read as buyer bad faith rather than market feedback; professional valuations that come in below expectation are attributed to the valuator missing something rather than to the entrepreneur’s figure being inflated.

The commercial outcome of this combination is measurable. Approximately 70% of businesses listed for sale never sell. Overvaluation is consistently cited by brokers and M&A practitioners as a primary driver. The endowment effect is not merely a psychological curiosity — it has a documented commercial cost that materialises precisely at the moment when accurate valuation matters most.

What actually helps

The most reliable corrective is professional valuation conducted before there is any emotional urgency to sell. A standardised valuation — using discounted cash flow analysis, industry multiples, and comparable transactions — produces a number that the endowment effect was not involved in generating. The earlier this number exists, the more time the entrepreneur has to recalibrate their expectations before a transaction makes the gap commercially binding.

The second is recognising that sweat equity, personal sacrifice, and emotional investment are not valuation inputs — for the buyer. They are real, they matter, and they deserve acknowledgement. But they belong in a different category from the financial metrics a buyer uses to assess risk and return. Separating the two is not a concession. It is the beginning of a negotiation that has a realistic chance of completing.

A book worth reading alongside this

Misbehaving by Richard Thaler is the most direct available account of the endowment effect from the researcher who named it. Thaler’s first-person description of how the research developed — including the wine economist example and the mug experiments — gives the mechanism a clarity and honesty that secondary accounts rarely match. For any entrepreneur approaching a valuation or exit conversation, it is the most useful preparation available.

Have questions about this article?

If any part of this article raised questions you want to explore further, courbot.co is built for exactly that. It is courben.co’s AI assistant, designed around the psychology of entrepreneurship. Ask it anything from this article.

This article discusses psychological patterns documented in research on behavioural economics and business valuation. It is not designed to provide financial advice. For valuation and exit planning, consult a qualified financial adviser or business broker.

This article is for educational and informational purposes only. It is not a substitute for professional financial or psychological advice.

Sources: Kahneman, D., Knetsch, J.L. & Thaler, R.H. (1990), Journal of Political Economy. Kahneman, D. & Tversky, A. (1984), American Psychologist. Norton, Mochon & Ariely (2012), Journal of Consumer Psychology. Tan et al. (2020), Journal of Behavioral Finance.