Loss Aversion and Reference Dependence¶

Why It Matters¶

This explains risk-seeking in the domain of losses, the endowment effect (valuing what you have more than identical things you don't have), and why framing matters so much. People will take risks to avoid a loss that they would never take to achieve an equivalent gain.

The Key Move¶

Identify the reference point. Outcomes above it are coded as gains, below as losses. Losses hurt roughly twice as much as equivalent gains please. Then ask: how does behavior change if we shift the reference point? The same objective outcome can produce different behavior with different framing.

Classic Application¶

Investment behavior. Investors hold losing stocks too long (hoping to avoid realizing the loss) and sell winners too early (locking in the gain). The disposition effect is driven by loss aversion - realizing a loss feels worse than the equivalent failure to realize a gain.

Surprising Application¶

Labor supply. Taxi drivers work longer on slow days (still in the "loss" domain relative to their daily earnings target) and quit early on busy days (already in the "gain" domain). This is backwards from rational income smoothing - they should work more when the hourly wage is high.

Failure Modes¶

• Assuming the reference point is obvious - it can be manipulated and is often path-dependent
• Treating loss aversion as universal - magnitude varies across people and domains
• Ignoring that reference points adapt - what feels like a loss today may feel like the status quo tomorrow
• Using loss aversion as an excuse for all risk aversion - not all risk aversion is loss aversion
• Missing that loss aversion can be overcome with experience and stakes

Go Deeper¶

Kahneman and Tversky's prospect theory papers. Thaler's work on the endowment effect. Camerer et al. on labor supply.