Definition
Overconfidence is a cognitive bias where investors overestimate their knowledge, ability to predict markets, or investing skill. This manifests as excessive trading (believing you can time markets), underdiversification (being too certain about specific picks), ignoring risks, or dismissing contrary evidence. Research shows overconfident investors trade more frequently, earn lower returns, and underperform passive strategies. Men typically display more overconfidence than women, leading to more frequent trading and lower net returns.
Example
After a few successful stock picks during a bull market, an investor believes they have special skill. They increase position sizes, trade more frequently, and abandon diversification - only to suffer significant losses when luck runs out.
FAQ
What is Overconfidence?
Excessive belief in one's ability to predict markets or pick stocks.
Why is Overconfidence important?
Overconfidence helps investors evaluate behavioral finance and make more informed decisions.