In a well-known experiment, one group of participants was given a coffee mug and asked the lowest price they’d sell it for. Another group, shown the identical mug but never given one, was asked the most they’d pay for it. The owners consistently demanded roughly twice as much as the non-owners were willing to pay — for the exact same mug. Simply owning something, even for a few minutes, made it feel more valuable. That’s the endowment effect, and it quietly distorts a surprising number of everyday money decisions.
What the Endowment Effect Is
The endowment effect is the tendency to place a higher value on something simply because you own it, compared to how much you’d value the identical item if you didn’t already own it. It’s distinct from the sunk cost fallacy: sunk cost is about weighing what you already spent; the endowment effect adds extra value just from possession itself, regardless of what was originally paid, or even whether anything was paid for it at all.
The Classic Mug Experiment
The mug experiment above (a real, widely replicated study) is notable because it removes every other explanation: the mugs were identical, randomly assigned, and had no purchase price or personal history attached to them. The only variable was which group happened to be holding the mug when asked its value — and that alone was enough to roughly double the price gap between what owners would accept and what buyers would pay.
Where It Shows Up With Money
- Overpricing something you’re selling — A used car, a piece of furniture, or a collectible often gets listed well above what similar items actually sell for, because ownership has quietly inflated the seller’s sense of its worth.
- Holding onto things you’d never buy at today’s price — An old gadget, an unused subscription, or a car you’re on the fence about replacing can feel harder to give up than it would be to simply not buy in the first place — even though giving it up and never having bought it end in the same place financially.
- Reluctance to declutter and sell unused items — Each item, once owned, tends to feel like it’s worth more than any realistic buyer would actually pay for it, which is part of why decluttering can feel harder than it “should.”
A Worked Example: Selling a Used Couch
Suppose a couch was bought two years ago for $800, and comparable used couches in similar condition are currently selling for $150–$200. The endowment effect can make an asking price of $400 or more feel entirely reasonable to the owner — not because of what was paid (that’s the sunk cost fallacy’s territory), but simply because it’s been theirs. The listing sits for months at that price, while a listing priced at what similar couches actually sell for tends to move quickly. The market’s silence — no offers, no interest — is itself useful information about where the endowment effect has pushed the price too high.
How to Price Around Your Own Endowment Effect
- Research what identical or comparable items are actually selling for right now, not what you paid or what it feels like it should be worth.
- Ask someone with no stake in the item — a friend, not the seller — to estimate its value from the same listing photos and description a stranger would see.
- If it’s sitting unsold for far longer than similar items usually take, treat that as real market feedback that the asking price is anchored too high, not as a reason to simply wait longer.
Frequently Asked Questions
Is the endowment effect the same as sentimental value?
They can overlap, but they’re not identical. Sentimental value is tied to a specific personal meaning (a family heirloom, a gift). The endowment effect happens even with plain, interchangeable objects that carry no sentimental weight at all — ownership alone is enough to trigger it.
Does the endowment effect apply to investments too?
Yes — it’s part of why investors can be reluctant to sell a specific holding even when they’d never choose to buy it fresh today with the same money. It often works alongside loss aversion and the sunk cost fallacy rather than acting alone.
How do professional resellers avoid this?
Largely by pricing systematically from comparable sales data rather than personal judgment, and by treating inventory as something to be moved at a market-clearing price rather than something to feel personally attached to.
The Bottom Line
Simply owning something makes it feel more valuable than it would to someone else looking at the exact same item — a real, well-documented effect that has nothing to do with what you originally paid or how much you actually like it. Pricing from comparable sales instead of personal attachment is the most reliable way to sell what you own instead of just listing it.
Further Reading
- The Anchoring Effect: How the First Number You See Changes What You’ll Pay
- The Sunk Cost Fallacy: Why It’s So Hard to Walk Away From a Bad Decision
- Selling Unused Items
- Risk & Decision-Making Hub
This article is educational only and is not financial, investment, or insurance advice. Investment and insurance decisions depend on your own circumstances — consider speaking with a qualified professional before acting.