The position was down 4% and I was already building a justification. The setup still looked valid. The thesis hadn't changed. The market was simply giving me a better entry price — or so the story went. I added. Then it dropped another 6%. I added again. By the time I stopped, I had tripled my original size into a trade that the market had been clearly rejecting for three sessions straight.

The thinking felt disciplined at the time. Lower average cost, same target, bigger eventual profit. What it actually was: a refusal to accept that the trade was wrong. Each addition wasn't a new decision — it was an emotional reaction dressed up in position-sizing language. The market was talking. I was too busy averaging down to listen.

CONCEPTAveraging down increases exposure to a thesis the market is already rejecting.
WARNINGTripling into a losing trade doesn't lower your risk — it multiplies it.
KEY IDEAA lower average entry is worthless if the position continues moving against you.

The root cause wasn't greed. It was a specific failure: I had no predefined rule for what invalidated the trade. Without that line in the sand, every new low became an invitation to add rather than a signal to exit. The position sizing tripled while my conviction should have been shrinking. That's the structural error — additions without invalidation criteria are just hope with leverage.

Adding to a Loser: Accelerating Drawdown 0% -5% -10% -18% Entry Add #1 Add #2 Exit 2x size 3x size Exit

The rule I extracted: a second entry into any position requires a written invalidation level set before the first entry is placed. Not after the loss. Before. This is a principle well-documented in risk management literature — what traders sometimes call defining your trade invalidation point before capital is committed. The broader concept sits inside position sizing theory, which treats each addition as a new risk event — not a discount. Understanding averaging down as a structural risk amplifier, not a cost-reduction strategy, is what finally made the rule stick.

The trade cost me more than the capital. It cost me three weeks of clean thinking while I tried to manage a position I should have cut on day one.

If you need to add to a trade to make it work, the trade wasn't working.

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