The endowment effect is the tendency to overvalue things simply because you own them — placing a higher price on what you possess than you would be willing to pay to acquire the same thing.
The Classic Experiment
Kahneman, Knetsch, and Thaler gave half of a group coffee mugs. When asked to trade, the mug owners demanded about twice what non-owners were willing to pay — for the same mug.
Why Ownership Changes Value
- Loss aversion: giving up the mug is coded as a loss; not gaining it is merely a forgone gain
- Psychological ownership creates emotional attachment rapidly
- The item becomes part of identity once owned
Where It Distorts Decisions
- Negotiations: Both parties overvalue what they're giving up relative to what they're receiving
- Investing: Holding underperforming stocks longer than rational because they're already in your portfolio
- Startups: Founders overvalue their own companies — makes fundraising rounds harder to price
- Real estate: Sellers systematically overprice their homes
Reference:
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