Anchoring Bias in Trading

Anchoring bias is the tendency to fixate on the first piece of information you receive and use it as the reference point for every subsequent decision. In trading, the anchor is almost always the same: your entry price.

The classic trap

You bought at $50. The stock is now $46. The thesis is broken, the invalidation level has printed, the market clearly disagrees — and you cannot sell, because “it’s not far from break-even”. The $50 has become sacred. Every future decision rotates around it.

The tape does not care about your entry. The market’s next move is independent of the price you paid.

Where it shows up in the trade log

• Break-even stops moved after entry — the anchor is the entry price rather than a real structural level.
• Refusal to close red trades near their stop because “it’s still close to entry”.
• Refusal to add to green trades because they’re “already extended from my entry”.
• Targets set as round-number multiples of entry rather than at actual structure.

The fix

Two rules break the anchor.

1. Structure-based stops, not entry-based stops. The stop lives where the thesis is wrong, not where your P&L becomes uncomfortable.
2. Rewrite the thesis at every review point. If a fresh you, with no position, would not enter here — the anchor is talking.

How EI ALGOS surfaces it

The Decision Score checks whether stops and targets are anchored to price structure or to the entry. When they anchor to entry, the score drops and LIANA surfaces the pattern in the review.

EI ALGOS is an educational decision-support platform. Nothing in this article is investment advice.