What is the Halo Effect ?
Our tendency to assume someone (or something) has generally positive traits, based solely on a good first impression.
Why is it a problem?
The Halo Effect prevents us from making accurate judgments. We paint a rosy picture based on a tiny amount of information.
We are susceptible to manipulation by people who know how to use it. Our brains are pretty much hard-wired to fall down logical slippery slopes.
For example, Con-men and scam artists make liberal use of the Halo Effect. They show you credibility in one very visible area, then your brain takes that credibility and extends it to other areas they don’t deserve.
Imagine someone knocking on your door on a quiet Saturday — you are curious, suspicious, and your guard is up. But when you open the door, it’s someone who is dressed in an worker’s uniform that has the logo of a local telco— your guard goes down, and your likelihood of compliance goes up.