Loss Aversion
Type: Systems & Dynamics
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Definition
Losses hurt more than equivalent gains feel good. Losing 100 feels good.
Kahneman & Tversky (1979): People require at least 100.
Why It Matters
Investing: Holding losing stocks to avoid realizing loss. Missing opportunities. Negotiations: Fighting harder to keep what you have than to gain something new. Politics: Voters punish losses more than they reward gains. Personal: Staying in bad situations to avoid the pain of change.
The Ratio
Research suggests losses are felt 2-2.5x more than equivalent gains.
| Gain | Loss | Equal emotional impact |
|---|---|---|
| +$100 | -$100 | Loss hurts 2x more |
| +$200 | -$100 | Roughly equal |
Manifestations
- Endowment effect — Things you own seem more valuable
- Status quo bias — Keeping what you have
- Sunk cost fallacy — Avoiding loss of investment
- Risk aversion — Avoiding losses over seeking gains
Fighting It
- Reframe — “What would I pay to acquire this?” vs “What would I accept to lose it?”
- Broaden frame — Lifetime perspective, not transaction
- Pre-commit — Decide rules in advance
- Accept losses — They’re part of the game
Related Biases
- Sunk Cost Fallacy — Loss aversion’s cousin
- Status Quo Bias — Fear of losing current state
- Endowment Effect — Overvaluing what you own
Audio
Podcast episode: Loss Aversion
Part of the Cognitive Bias Reference