Explain the disposition effect and loss aversion
The idea
Loss aversion means losses are felt roughly twice as strongly as equivalent gains, so investors take more risk to avoid realising a loss than they would to secure a gain. The disposition effect follows: winners are sold too early to lock in the good feeling, losers held too long to postpone the bad one. The portfolio consequence is a holding period systematically related to performance rather than to prospects, and in taxable accounts it is exactly backwards, since, where there are gains to offset, realising losses is the tax-efficient action.
A practice question
What does the disposition effect describe?
- Holding a portfolio without ever tradingWhy not: Inactivity across the board. The effect is specifically asymmetric between winners and losers.
- Selling winners too soon and holding losers too long — correct
- Buying only securities that have recently risenWhy not: Momentum chasing, which concerns purchases rather than which existing positions are sold.
The decision to sell tracks the position's own purchase price rather than its prospects, which is a reference point with no bearing on future returns.
A harder one
Why is the disposition effect particularly costly in a taxable account?
- Because it accelerates tax and forgoes offsets — correct
- Because losses cannot be deductedWhy not: In most regimes they can be, against gains — which is exactly the benefit the bias forgoes.
- Because tax rates rise with holding periodWhy not: Rates generally fall with holding period where they vary at all, which cuts the other way.
Realising gains early accelerates the tax while deferring loss realisation forgoes the offset. The tax-efficient behaviour is the reverse — harvest losses, defer gains — so the bias pushes the investor to do exactly the wrong thing on both sides.
The hardest tier
Loss aversion causes an investor to take more risk in one situation than another. Which, and why?
- More risk when sitting on a gain, to protect itWhy not: Protecting a gain means taking less risk. Sitting on a gain makes investors cautious, not bolder.
- Risk appetite is unaffected by whether the position is up or downWhy not: That would be the rational benchmark, and the departure from it is the finding.
- More risk when sitting on a loss — correct
Avoiding the realisation of a loss is worth more than the expected cost of the gamble. The asymmetry flips risk preference around the reference point: cautious in the domain of gains, risk-seeking in the domain of losses, which is why a losing position often grows rather than being cut.
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