Confirmation bias is a cognitive tendency to favor information that supports existing beliefs while discounting data that contradicts them. In investing and markets, this can shape how data, news, and research are gathered and interpreted.
Researchers and practitioners may selectively seek sources that confirm a prior forecast, interpret ambiguous earnings or guidance as supportive, and remember favorable data while forgetting weaknesses. This can lead to slower revision of views when new evidence appears and can bias assessments of risk and return.
During a quarterly review, an analyst highlights favorable revenue trends while discounting a softer gross margin figure that contradicts the initial thesis.
The bias can distort decision making, contributing to overly confident conclusions and persistence in mistaken views. Mitigation approaches include explicitly seeking disconfirming evidence, using checklists or decision rules, setting predefined criteria for action, and inviting independent review of analyses.
During a quarterly review, an analyst highlights favorable revenue trends while discounting a softer gross margin figure that contradicts the initial thesis.
Cognitive bias · Anchoring · Overconfidence bias · Selective exposure · Hindsight bias