Cognitive biases & decision-making · law 068
Confirmation Bias
By Shivam Bhandari · Reviewed 31 October 2026 · How we write
what it means
People search for, notice, and remember information that confirms what they already believe, and ignore what contradicts it.
How Confirmation Bias works
Once we have a view — this product will work, this hire is great, that market is dead — we unconsciously filter evidence to support it. Contradicting data feels like noise.
In business, confirmation bias leads to doubling down on bad ideas, ignoring early warning signs, and building echo chambers in leadership teams.
where it comes from
Psychologist Peter Wason demonstrated it in 1960 with his ‘2-4-6’ number task, where most people tested only examples that fit their first guess.
Confirmation Bias examples in business
Product launches
A founder focuses on five enthusiastic customer comments and ignores 50 people who never came back.
Hiring
An interviewer who likes a candidate early asks easy questions to confirm the impression.
Investing
An investor reads only bullish news about a stock they already own.
How to apply it
- 1Before a decision, write down what evidence would prove you wrong.
- 2Actively seek that evidence.
- 3Assign someone to argue the opposite case in key meetings.
- 4Track decisions and outcomes to see where your beliefs misled you.
common misreading
Having beliefs isn't the problem — refusing to update them is.
ask yourself
What evidence would change your mind about your current biggest bet?
put it into practice
Frequently asked questions
What is Confirmation Bias?
People search for, notice, and remember information that confirms what they already believe, and ignore what contradicts it. Once we have a view — this product will work, this hire is great, that market is dead — we unconsciously filter evidence to support it. Contradicting data feels like noise.
Who came up with Confirmation Bias?
Psychologist Peter Wason demonstrated it in 1960 with his ‘2-4-6’ number task, where most people tested only examples that fit their first guess.
How do you apply Confirmation Bias in business?
1. Before a decision, write down what evidence would prove you wrong. 2. Actively seek that evidence. 3. Assign someone to argue the opposite case in key meetings. 4. Track decisions and outcomes to see where your beliefs misled you.
What is a common misunderstanding of Confirmation Bias?
Having beliefs isn't the problem — refusing to update them is.