Hindsight Bias

After a sharp market decline that almost no forecaster called in advance, client Desmond Achterberg tells his IAR that the downturn was obvious all along and that they should have moved to cash beforehand. The bias he is displaying is:

1. A.Hindsight bias, because knowing the outcome has made a genuinely unforeseeable event feel as though it had been predictable.Correct. Memory of prior beliefs shifts toward the realized outcome, inflating confidence in his own foresight and encouraging market timing.
2. B.Regret aversion, because he is reluctant to make a decision he might later regret.Incorrect. Regret aversion produces hesitation about FUTURE decisions. He is making a confident claim about the past.
3. C.Confirmation bias, because he seeks out information that supports a view he already holds.Incorrect. He is not filtering evidence for an existing thesis; he is misremembering how predictable a past event was.
4. D.Loss aversion, because the pain of the decline exceeds the pleasure of an equivalent gain.Incorrect. Loss aversion describes asymmetric feelings about outcomes; it does not involve a claim that the outcome was foreseeable.

Why: This is hindsight bias, the tendency to believe after the fact that an outcome was predictable before it occurred. Once people know how events turned out, their memory of what they previously believed shifts toward the realized outcome, so genuinely uncertain events feel as though they were foreseeable. It is damaging because it makes investors overestimate their own forecasting ability, which in turn encourages market timing and abandonment of a documented long-term plan. The practical defence is contemporaneous documentation: a written investment policy statement and dated meeting notes let the adviser show what was actually known and decided at the time.

Following a sharp market decline, client Perrine Vasquez-Oyelowo tells her adviser that the drop was "completely obvious in advance" and insists she should now be allowed to time future corrections, though her records show she made no such call beforehand. This behavior best illustrates:

1. A.Hindsight biasCorrect. Recasting an unpredicted outcome as obvious after the fact is hindsight bias.
2. B.FramingFraming concerns how a choice is presented, not retrospective judgment of an outcome.
3. C.Regret aversionRegret aversion causes inaction to avoid future regret; she is urging more action.
4. D.Recency biasRecency bias extrapolates recent returns forward; her claim is about having foreseen the past.

Why: Hindsight bias is the tendency to view a past outcome as having been predictable once it is known. Its practical danger is that it inflates confidence in one's forecasting ability and encourages market timing that the client has never actually demonstrated. Keeping a contemporaneous written record of forecasts and the reasoning behind them is the standard countermeasure.