Overconfidence Effect

The overconfidence effect is a bias where a person's subjective confidence in their judgments is reliably greater than the objective accuracy of those judgments. In trading, this often manifests as excessive risk-taking, underestimating the probability of a market downturn, or failing to hedge positions appropriately.

Traders who have experienced a string of successful outcomes are particularly susceptible to this bias, believing they have discovered a permanent edge. This leads to the abandonment of risk management protocols and the use of excessive leverage.

To counter the overconfidence effect, traders should maintain a humble approach, continuously backtest their strategies, and keep detailed journals of their decision-making process. It is a dangerous trap that has ended many promising trading careers.