Definition
The disposition effect is the pattern in which investors sell assets that have gained in value more readily than assets that have lost value, holding losers in the hope of recovery and realizing gains too quickly.
Why it matters
The disposition effect has direct implications for how individuals manage retirement savings before and during retirement. Portfolios are reshaped by selling winners and holding losers over time, and this pattern interacts with tax treatment, portfolio drift, and the sequence of returns risk that affects retirement outcomes. In the decumulation phase, the disposition effect can shape which assets are drawn from first and which are preserved.
How it works
The disposition effect was documented by Shefrin and Statman in 1985 and has been replicated in individual investor account data across many markets. The mechanism is typically interpreted through prospect theory: individuals evaluate holdings relative to purchase price, gains and losses are treated asymmetrically, and the utility function is concave over gains and convex over losses. Selling a gain locks in a certain positive outcome (which is preferred under concavity over gains); holding a loss keeps open the possibility of recovery (which is preferred under convexity over losses). The pattern persists even when tax considerations would recommend the opposite behavior, because tax-loss selling is often more valuable than realizing gains prematurely. The disposition effect is a canonical example of reference-dependent, loss-averse behavior in real investment decisions.
In practice
For an individual approaching retirement or making decumulation decisions, the disposition effect is a caution against letting purchase price drive current portfolio decisions. Which assets to draw from in retirement is properly a function of tax treatment, asset allocation targets, and expected forward returns, not of what the assets cost when acquired. A useful practice is to ask a professional to evaluate the portfolio from a fresh-money perspective: if the individual were assembling the portfolio from cash today, which assets would they hold and at what weights? Deviations from that fresh-money portfolio identify positions held for disposition reasons rather than portfolio-construction reasons. In the lifetime income context, the disposition effect can also shape the choice of which assets are used to fund an annuitization, since the reflex to preserve a "winner" can compete with the arrangement's actual analytical case.
Related terms
- Prospect theory
- Reference dependence
- Loss aversion
- Mental accounting
- Sequence of returns risk
- Realized value
- Cost basis in annuity context