# Confirmation Bias

*Behavioral Finance — Finicade finance glossary*

Confirmation bias is seeking and weighting evidence that supports what you already believe while discounting what doesn't. It's why a thesis grows more confident with research rather than being tested by it. The practical countermeasure is structural rather than motivational: write down in advance what evidence would make you sell, and have someone argue the opposite case before you commit.

**Also known as:** confirmatory bias, motivated reasoning

**Related terms:** [Behavioral Biases](https://finicade.com/glossary/behavioral-biases), [Overconfidence](https://finicade.com/glossary/overconfidence), [Narrative Fallacy](https://finicade.com/glossary/narrative-fallacy), [Due Diligence](https://finicade.com/glossary/due-diligence), [Hindsight Bias](https://finicade.com/glossary/hindsight-bias)

**Taught in:** Mind Over Markets — Hindsight & Confirmation

Source: https://finicade.com/glossary/confirmation-bias