Loss Aversion
Daniel Kahneman & Amos Tversky · Prospect Theory (1979)
People feel the pain of a loss about twice as intensely as the pleasure of an equivalent gain, leading to a powerful bias toward avoiding losses over acquiring gains.
Core Concepts
The Problem
Why do people systematically overvalue stability and undervalue potential gains in decisions?
The Claim
The psychological impact of losing is greater than that of winning, which distorts risk assessment and choice.
Key Evidence
- •Prospect theory experiments showing risk aversion in gains and risk seeking in losses.
- •Field studies in investing, negotiation, and consumer behavior.
Practical Implication
Loss aversion explains phenomena like the endowment effect, status quo bias, and the difficulty of letting go of failing projects.
Nuance & Limits
The reference point matters; losses are defined relative to a shifting baseline. The magnitude of loss aversion can vary across contexts.
Source Material
Citation Density
Extremely well-cited; one of the most replicated findings in behavioral economics.
Related Ideas
General tendency for negative information to have more weight.
Overvaluing what one already possesses.
Discuss Further
Open this concept in an AI assistant for deeper discussion, critique, or exploration.