Endowment effect
The endowment effect is the tendency to value something more highly simply because you own it. Once a thing is yours, parting with it feels like a loss — so you demand more to sell it than you would have paid to buy the very same thing.
Why it happens
Loss aversion is the engine: giving up a possession registers as a loss, which weighs about twice as heavily as the pleasure of an equivalent gain. Ownership also folds the object into your sense of self, so selling feels like losing a part of you, not just making a trade.
Ownership puts a valuation bonus on whatever you hold that has nothing to do with its actual worth.
Examples
- In the classic mug experiment, people given a mug demanded roughly twice the price to sell it that others would pay to buy the same mug.
- Sellers overpricing their home because it is "theirs," ignoring what buyers will actually pay.
- Refusing to cancel a subscription you never use because dropping it feels like giving something up.
How to counter it
- Ask the buyer’s question: "If I didn’t already own this, what would I pay for it today?"
- Reframe the decision as a fresh choice between the cash and the object, not as a loss.
- For investments, judge each holding as if your portfolio were rebuilt from scratch this morning.
The deeper point
It puts a permanent valuation bonus on whatever you already hold — a bonus that has nothing to do with the thing’s actual worth. That’s why decluttering and selling losing investments both feel disproportionately painful: you’re not weighing value, you’re defending ownership.
Frequently asked
- What is a simple example of the endowment effect?
- You would sell a concert ticket you own for $200 but wouldn’t have paid more than $80 to buy it. Ownership alone inflated its value to you.
- What causes the endowment effect?
- Mainly loss aversion — giving up something you own feels like a loss, weighed about twice as heavily as an equal gain — plus the way ownership ties an object to your sense of self.
- How is the endowment effect different from loss aversion?
- Loss aversion is the general rule that losses hurt more than equal gains. The endowment effect is one consequence: because selling feels like a loss, we overvalue what we already own.
Related
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See this alongside the other thinking tools of negotiation.
This bias distorts negotiation and shopping & spending.
Go deeper
The book behind this idea: Thinking, Fast and Slow by Daniel Kahneman. Hear the whole thing free — start an Audible trial and your first audiobook is on the house.
Read the full summary of Thinking, Fast and Slow →
More canonical picks:
- 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
ReadGlobe. (2026). Endowment effect. https://readglobe.com/bias/endowment-effect/
"Endowment effect." ReadGlobe, 29 May 2026, readglobe.com/bias/endowment-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.