It was a Thursday morning and I was already sizing up twice before the open. Four green days in a row had done something quiet and dangerous to my brain — I genuinely believed I'd figured something out. Not the system. Not the edge. Me, personally. I had ascended. The market was about to remind me what ascension actually costs.

That's recency bias doing its filthy work. The brain assigns disproportionate weight to recent events and quietly buries the longer statistical record. Four wins feel like destiny. Four losses feel like the system is broken. Neither is true. Both feelings will absolutely bankrupt you if you let them steer.

CONCEPTRecency bias makes your last five trades feel more predictive than your last five hundred.
WARNINGDoubling size after a hot streak is not confidence — it's recency bias wearing a costume.
KEY IDEAYour edge lives in the distribution of outcomes, not in last week's highlight reel.

Mark Douglas hammers this in Trading in the Zone — every trade is just one sample from a large distribution. The outcome of the last trade is statistically irrelevant to the next one. Yet our pattern-hungry brains insist on building a narrative. Hot streak? You're sharp. Cold streak? You're broken. The market doesn't know either story exists.

Perceived Win Rate vs Actual Edge 0% 30% 60% 90% After loss run Neutral After win run Actual edge (55%) Perceived (biased)

Thursday ended badly. Obviously. I'd doubled size into a mean-reverting chop session because four good days had rewritten my risk tolerance in pencil over the permanent ink of my rules. The loss itself was manageable. The realisation that I'd let a tiny recent sample override fifteen years of system data — that stung considerably more. Traders use equity curve analysis and rolling win-rate tracking to combat this, keeping the full distribution visible rather than just the emotional highlight reel. Resources like Investopedia's breakdown of recency bias and the broader cognitive bias research on Wikipedia confirm what Douglas already knew — the mind is a terrible risk manager left unsupervised.

The system doesn't care what happened last week. Neither should you.

This content is for educational purposes only and does not constitute financial product advice. Past performance is not indicative of future results. Profit Logic Ltd (ACN 688 669 936) accepts no responsibility for errors or omissions in this content or anywhere on this website. Always seek advice from a licensed financial adviser before making investment decisions.