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Behaviour

A forecast you hear twice starts to feel like a fact

Repetition raises confidence in a claim independently of any evidence for it, which is why widely repeated market predictions feel established long before anything confirms them.

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A prediction encountered several times begins to feel settled. The increase in confidence comes from the repetition rather than from anything that happened in between.

Familiarity is processed as truth

Statements encountered before are easier to process on a second encounter, and that ease is experienced as a sense of correctness rather than as recognition.

The effect operates below the level of deliberate judgement. People who can correctly identify a claim as unverified still rate it as more plausible after repeated exposure.

It works on plainly false statements as well as on plausible ones. Repetition does not need the underlying claim to have any merit in order to raise confidence in it.

Financial commentary repeats by construction

A view that gains traction is quoted, aggregated and summarised across many outlets. One source produces dozens of encounters without any additional evidence entering the process.

Readers cannot easily distinguish many independent assessments from many reproductions of one. Both look like breadth of opinion when scrolling through a feed.

Aggregation compounds it further. A summary of commentary is itself commentary, and a widely held view is described as widely held partly because it is described often.

Consensus is not evidence about the future

A widely repeated forecast is information about what participants expect. Because expectations are already reflected in prices, it is not information about what will happen next.

This is the part that reverses intuition. In most contexts, many people agreeing raises the odds of being right; in markets it mostly means the view is already priced.

Acting on a consensus forecast therefore involves paying prices that already assume it. The gain would come from the forecast being wrong in a particular direction.

Where it does damage

The illusion of established fact loosens plans. Someone who would not deviate on a hunch may deviate on something that feels like accepted knowledge about the coming year.

The deviation is usually presented as prudence rather than as prediction. Reducing exposure ahead of an expected difficulty sounds cautious, but it is a forecast being acted upon.

It is also asymmetric in what it prompts. Repeated pessimism produces action far more often than repeated optimism, because avoiding loss feels more urgent than pursuing gain.

Counting sources rather than mentions

The practical defence is to ask where a claim originated and how many distinct assessments actually exist behind it. That count is usually far smaller than the number of encounters.

Tracing the origin also reveals the confidence attached at source, which is frequently hedged in ways that vanish in retelling. Qualifiers are the first thing lost in summary.

None of this settles whether a forecast is right. It restores the sense that it is a forecast, which is enough to stop it being treated as a fact about the future.

Questions readers ask

Does the witness need to understand investing?

No. Their job is to remember what you said and ask about it. Someone with strong opinions about holdings is usually a worse choice than someone with none.

What if my plan genuinely needs changing?

Then change it through the procedure you wrote down, which normally means a delay and a written reason. The point is to filter impulses, not to freeze the plan.

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Bethan Rees
Contributing writer, The Investment Habit

Bethan writes about drawdown and turning a portfolio back into an income.

Also by Bethan Rees