Definition
Confirmation bias causes investors to selectively gather evidence supporting their existing positions while dismissing contradictory data. A bull on a stock reads every positive headline while ignoring warning signs. This bias is amplified by social media echo chambers and leads to overconfidence, concentrated positions, and failure to properly assess risk.
lightbulb Example
An investor bullish on a tech stock reads 10 positive analyst reports and dismisses 3 negative ones as "not understanding the business." They ignore declining margins and increasing competition because it contradicts their thesis.
verified_user Key Points
- Seek information confirming existing beliefs
- Dismiss contradictory evidence
- Amplified by social media echo chambers
- Leads to overconfidence and poor risk assessment