No. 78 · People · Human Nature and Judgement
Halo Effect
One shining quality makes us rate everything else about a person or product higher.
In the Almanac
“Thorndike’s officers”, 1920 · “Nike and Michael Jordan”, 1984–2022
Both stories in full, three ways to use it and where it misleads.
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Questions
What is Halo Effect?
The halo effect is our tendency to let one positive trait colour our judgement of everything else about a person, product or brand. Psychologist Edward Thorndike found that officers who rated soldiers well on one quality tended to rate them well on unrelated ones. One shining quality can hide real weaknesses.
How do you use Halo Effect?
Judge qualities separately: use a scorecard with distinct criteria rather than an overall impression. When you are impressed by someone or something, deliberately look for drawbacks, and for important decisions like hiring, use structured evaluations that keep one standout trait from deciding everything.
When does Halo Effect matter?
Halo Effect is one of the 60 mental models for people, the situations where you ask: Why do people act as they do, and how do I work with them? Within that, it belongs to “How we judge others”, alongside False Consensus Effect, Fundamental Attribution Error and Hanlon’s Razor.
What is an example of Halo Effect?
Two stories show it at work: Thorndike’s officers (1920) and Nike and Michael Jordan (1984–2022). Both are told in full in The Mental Models Daily Almanac, which has two stories for each of its 365 models.
Which mental models are related to Halo Effect?
Horn Effect, Appeal to Authority and Liking and Loving Tendency. Halo Effect itself comes from human nature and judgement.