What are Behavioral Biases?
Behavioral biases are systematic cognitive distortions that cause investors to make predictable errors in judgment, such as overconfidence, loss aversion, and confirmation bias.
Behavioral biases are psychological patterns that distort judgment: overconfidence bias, loss aversion, anchoring, confirmation bias, and recency bias lead to irrational investment choices.
- •Overestimate knowledge and predictive ability
- •Overtrade and take excessive risk
- •Typical of young, male investors
- •Feel pain of loss more than joy of gain
- •Hold losers too long (hoping to break even)
- •Avoid risk after losses
Step-by-step worked examples
An investor, convinced of their stock-picking ability, trades 50% of portfolio monthly. Bias?
Overconfidence bias Belief in superior skill Excessive trading (churn) Underperforms due to costs and turnover
A trader bought at $100, sells at $80 loss, then delays selling at $50. What is this?
Loss aversion + anchoring Stuck to purchase price anchor Refuses to accept loss Hopes to break even (unlikely)
Investor reads only bullish news about their holdings. What is this phenomenon?
Confirmation bias Seek supporting information Ignore contradictory evidence Reinforce existing beliefs regardless of reality
Flashcards
Quick quiz
Q1.Overconfidence bias typically leads to…
Q2.Loss aversion explains why investors…
Q3.Anchoring bias occurs when investors…
Q4.Recency bias leads investors to…
The full card deck, worked steps and AI-tutor support for “What are Behavioral Biases?” are in Notek — study by hand before your exam.
Common mistakes
Biases only affect retail investors, not professionals. — Correct: Studies show professionals and experts are susceptible to the same cognitive distortions.
Strong returns prove your strategy is superior. — Correct: Short-term luck and market timing can mask inferior strategy or hidden risks.
You can completely eliminate your behavioral biases. — Correct: Awareness helps reduce them, but systematic safeguards (rules, diversification) are more effective.
Diversification eliminates behavioral bias. — Correct: Diversification reduces risk; combating bias requires awareness and discipline.
FAQ
What are behavioral biases?
Systematic cognitive distortions causing predictable errors in judgment: overconfidence, loss aversion, anchoring, confirmation bias, recency bias.
Why do investors hold losing stocks?
Loss aversion makes the pain of losses feel more intense; they anchor to purchase price and hope to break even.
How can I reduce behavioral biases?
Create rules-based strategies, set stop-losses, diversify, avoid emotional decisions, and regularly review holdings.
Do professional investors have biases?
Yes; research shows even seasoned investors fall prey to overconfidence, anchoring, and other cognitive distortions.