10/16/2026
Research from Dalbar's 30th Annual Quantitative Analysis of Investor Behavior consistently finds that the average investor underperforms the broader market by 3–5% annually. The cause is not poor investment selection. It's behavior.
The pattern is well-established: investors tend to buy after prices have risen — when confidence is high — and sell after prices have fallen — when fear is at its peak. The result is a systematic return gap that compounds significantly over time. Over a 30-year horizon, the cumulative cost on a single portfolio can reach hundreds of thousands of dollars.
The problem is compounded for retirees who are simultaneously withdrawing from their portfolios. An emotionally driven sale during a downturn doesn't just realize a loss — it permanently reduces the capital base available to participate in any subsequent recovery.
The intuitive response — developing better judgment about when to buy and sell — misidentifies the solution. Behavioral gaps persist not because investors lack intelligence, but because the emotional conditions during market stress are genuinely difficult to override in real time.
The more effective approach is a strategy with predefined rules: when to rebalance, which assets to liquidate first, how much to withdraw and under what conditions. A framework established during calm periods provides a decision-making structure that doesn't depend on emotional clarity during the worst moments.
Process beats willpower. Consistently.
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Source: Dalbar 30th Annual QAIB Report