Trading psychology: 6 costly biases (and how to neutralise them)

Two traders can follow exactly the same method and get opposite results. The difference rarely lies in the analysis and almost always in execution — in other words, in the mind. Research in behavioural finance, notably the work of Daniel Kahneman and Amos Tversky, has described systematic biases that affect everyone. Knowing them is not enough to avoid them, but it lets you build rules that neutralise them.

1. Loss aversion

A loss hurts psychologically about twice as much as an equal gain feels good. In trading this produces a very costly behaviour known as the disposition effect: we bank gains quickly (to “lock in” the pleasure) and hold losses (to avoid “realising” the pain). The result: small average wins, large average losses, and expectancy that turns negative.

Antidote: set stop-loss and target before entering, as real orders, and forbid yourself from moving the stop further away.

2. Revenge trading

After a loss, the urge to “win it back” immediately is powerful. The next trade is taken faster, bigger and on a weaker setup. It is one of the most destructive behaviours because it combines anger with increased risk.

Antidote: a break rule. For example: after 3 consecutive losses or −3% on the day, stop until tomorrow. No negotiation.

3. Overconfidence

A winning streak creates the feeling of having “figured out the market”. Sizes go up, entry criteria loosen… and the streak, often partly due to luck and favourable conditions, ends at the worst moment.

Antidote: position size computed by formula (the 1% rule), never by feel. Growing capital raises size automatically — and reasonably.

4. Confirmation bias

Once in a position, we look for information that proves us right and ignore the rest. The losing long becomes “a great chance to add”; contrary signals in the order flow are deemed “not significant”.

Antidote: before entering, write down what would invalidate your scenario. If it happens, get out.

5. Fear of missing out (FOMO)

Price takes off without you. You buy late, far from any logical level, with a stop that cannot be placed properly. FOMO is especially strong in crypto, where 10% moves in an hour are not unusual.

Antidote: a written list of your setups. If the trade is not on it, it does not exist. There will always be another opportunity.

6. Anchoring

We cling to a reference price: the purchase price, an old high, a target read on social media. “I’ll sell once it gets back to my entry” is an anchoring sentence: the market has no idea what price you paid.

Antidote: every day, ask yourself “if I did not have this position, would I open it now?”. If the answer is no, think seriously about closing it.

Build your framework

A trading journal completes the setup: by recording for each trade whether the plan was followed, you will measure exactly what your biases cost you. The simulator is an excellent training ground for installing these rules, even if it cannot reproduce the full emotional pressure of real money.