Definition
Action Bias
Action bias is the tendency to feel compelled to 'do something' — to trade or tinker — especially in volatile markets, even when doing nothing would serve you better.
During market turmoil, inaction feels uncomfortable, so investors churn portfolios, switch funds or try to time entries and exits, usually adding costs and taxes while harming returns. The urge to act is emotional, not analytical, and it often converts temporary paper losses into permanent ones.
The antidote is a pre-set plan that makes patience the default: a fixed asset allocation, automatic SIPs and scheduled rebalancing reduce the perceived need to react. Recognising that, in long-term investing, masterly inactivity frequently beats frantic activity is a hard but valuable discipline.
Related terms
- Overconfidence BiasOverconfidence bias is the tendency to overestimate your own knowledge, skill or accuracy, leading to excessive trading and concentrated bets.
- Analysis ParalysisAnalysis paralysis is when too many options and too much information leave you so overwhelmed that you delay or avoid making a financial decision.
- Behavioral FinanceBehavioral finance is the field that studies how psychology and cognitive biases affect the financial decisions of investors and markets, departing from the assumption of perfectly rational actors.
Plain-English explainer from The Dispatch Investors Encyclopedia. General information, not financial advice.