Atlas of Cognitive Biases #29 · Information and beliefs. One strength isn't all strengths
What it looks like in trading
a trader with an expensive car must have a good method
one spectacular trade makes the whole system look great
a nice chart and a professional look taken as proof of quality
An example from a session
An influencer shows a screenshot of a big profit. The viewer assumes their analysis, risk management and results are just as good. They know nothing about the other trades (survivorship bias).
What the research says
Edward Thorndike (1920) noticed that officers rating soldiers gave the same people high or low marks in all categories at once. Nisbett and Wilson (1977) showed that people aren't aware of this influence.
One striking trait (positive or negative) colours our judgement of all the others.
How does the halo effect show up in trading?
Typical signs: a trader with an expensive car must have a good method; one spectacular trade makes the whole system look great; a nice chart and a professional look taken as proof of quality.
Educational content, not psychological advice or an investment recommendation.