Confirmation Bias
Money & Trading
Confirmation bias is the tendency to seek out, favor, and remember information that supports what you already believe — while dismissing or never even encountering evidence against it.
What it looks like
If you believe a stock is a great buy, you read bullish analyst notes, follow bullish accounts, and interpret bad news as a buying opportunity. Bearish research gets skipped or explained away.
It shapes everyday life too: people choose news sources, friends, and feeds that reflect their existing views, which makes those views feel universally shared.
In trading and money decisions
A trader with a thesis searches for evidence it's right, not evidence it's wrong. Every green candle confirms the idea; every red one is noise. Stop-losses get moved, then ignored.
The antidote is procedural: write down what would prove you wrong before entering, actively seek the strongest opposing case, and treat disconfirming evidence as the most valuable information available.
Common questions
- What is an example of confirmation bias in investing?
- An investor who believes a company is undervalued reads only bullish reports, joins forums of fellow believers, and interprets each price drop as a better entry — while never reading the short-seller's case against it.
- Why do we have confirmation bias?
- It's cognitively cheap: confirming what we think requires less effort than rebuilding a belief, and it protects us from the discomfort of being wrong. It's a feature for belonging, a bug for accuracy.
- How do you fight confirmation bias?
- Assign yourself the opposing case, ask what would change your mind before deciding, and keep a decision journal so you can compare what you believed with what the evidence actually said.
Related biases
- Anchoring BiasAnchoring bias is the tendency to rely too heavily on the first piece of information you encounter — the anchor — when making judgments, even when that number is arbitrary or irrelevant.
- Loss AversionLoss aversion is the finding that losses feel roughly twice as powerful as equivalent gains — losing $500 hurts far more than winning $500 feels good, so people go to great lengths to avoid losses.
- Sunk Cost FallacyThe sunk cost fallacy is continuing an endeavor because of what you've already invested — money, time, effort — rather than because of what lies ahead. Sunk costs are gone; only future costs and benefits should matter.
Check your own reasoning
Paste the thinking behind your next decision and see which biases are likely shaping it.
Open the Bias Checker