It was 11:47am on a Tuesday and I was staring at a position that had just turned green after three days of bleeding. My system said hold. My stomach said take the money and run. I took the money and ran. The trade ran another 4% without me while I sat there refreshing my broker screen like a haunted man.
That right there is the pendulum. Not some abstract concept from a textbook — a very real, very embarrassing swing from greed-chasing on the entry to fear-driven exit. The technical term is loss aversion bias, and it hits differently when you realise your own brain is working against your own system.
The fear-greed pendulum swings hardest right after two specific events: a string of wins and a string of losses. After wins, greed convinces you the system is infallible and you size up recklessly. After losses, fear convinces you the system is broken and you size down or stop trading entirely — usually right before the drawdown recovers.
The antidote traders use isn't willpower — it's architecture. Pre-defined rules, position sizing frameworks, and written trading plans create decisions made when you were calm, not reactive. Studying loss aversion psychology helped me understand why pain feels twice as loud as equivalent gain. The broader concept is explained well through prospect theory, and Investopedia's overview of the fear and greed index shows how this psychology plays out at a market-wide scale, not just in one trader's sweaty hands.
The market doesn't care about your feelings. Your job is to make sure your feelings don't care about the market either.
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