What happens to your judgement when a position is down 8% and still open?

Why this matters. Everything else in this course happens inside this state. You cannot rehearse it on paper, because on paper the number is not yours.

The position is open. It is down 8%. Nothing has been decided yet, and that is precisely the problem: an open position is a decision you are still making, over and over, every time you look at it.

Three things change at once

The reference point moves. Your entry price becomes the line the world is measured against — not the price today, not what the thing is worth, but what you paid. Replicated: this asymmetry around a reference point is the value function Kahneman and Tversky described in 1979, and it is a population finding Portfolio Management teaches in full — see Loss aversion and the disposition effect. Our subject is not that it exists. It is that right now it is your reference point, and you did not choose it.

The question quietly changes. You sat down to answer is this still worth holding? By the time the position is down, you are answering will it come back? Those are different questions with different evidence, and nobody announces the switch.

Time compresses. Attention narrows onto the position. Everything else on your screen becomes background. Documented but thin: a field study of seventeen traders over eight days found cortisol rising with market variance (Coates and Herbert, 2008) — suggestive, seventeen people, not a general result. The narrowing is real in the room; the mechanism is not settled.

What you can actually observe

You cannot audit your own judgement while it is running. You can audit what you wrote before it started. This is why every lesson in this course ends at a record: the record is the only part of the moment that survives it.

Your artefact here is the position note: the sentence you wrote at entry saying what would make this idea wrong. Not a price — a condition. If you cannot find that sentence, the honest reading is that you have no way to tell "this is invalidated" from "this is uncomfortable", and at 8% down those feel identical.

Try it now

Take any position you have held through a drawdown, real or hypothetical, and write the invalidation sentence you would have needed at entry. Notice how much harder it is to write now that you know what happened.