🎓 Prepared by students from Boğaziçi University

What is Behavioral Finance?

Behavioral finance combines psychology and economics to explain why investors make irrational financial decisions, incorporating emotions, biases, and social factors.

Short answer

Behavioral finance studies how psychology influences financial decisions. Emotions, cognitive biases, and herd behavior often override rational thinking and create market inefficiencies.

The Behavioral Finance Decision Process

1
Information Input
Investor receives financial information
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2
Psychological Filter
Emotions, biases, and heuristics distort perception
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3
Irrational Decision
Fear/greed drives choice instead of logic
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4
Market Outcome
Collective bias creates mispricing

Step-by-step worked examples

During a market crash, an investor panics and sells profitable positions. Why?

Loss aversion + fear
Investor overweights recent losses
Ignores long-term strategy
Panic selling locks in losses during temporary dip

A trader holds a losing stock hoping to break even. What bias is at play?

Anchoring bias
Trader anchors on purchase price
Ignorant of new information
Keeps position despite negative fundamentals

An investor only reads positive news about their stock. What is this called?

Confirmation bias
Seek info supporting existing belief
Ignore contradictory evidence
Leads to overconfidence and poor decisions

Flashcards

Quick quiz

Q1.Loss aversion means investors…

Correct answer: B. Loss aversion is the psychological tendency to avoid losses more strongly than pursuing gains.

Q2.Herd behavior in markets occurs when…

Correct answer: C. Herd behavior means investors copy others regardless of fundamental analysis.

Q3.What is FOMO in investing?

Correct answer: A. FOMO drives investors to chase trends and buy near peaks.

Q4.Overconfidence bias leads to…

Correct answer: B. Overconfident investors overtrade and underestimate risks, often underperforming.

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Common mistakes

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Behavioral finance says all investors are irrational. — Correct: It shows systematic biases exist; some investors recognize and manage them.

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Markets are perfectly efficient and free from bias. — Correct: Collective biases create mispricings and market cycles.

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Professional investors are immune to behavioral biases. — Correct: Even experts fall prey to emotions and cognitive distortions.

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You can't overcome your own biases. — Correct: Awareness, discipline, rules-based systems, and emotional control help mitigate biases.

FAQ

What is behavioral finance studying?

How psychology, emotions, and cognitive biases influence financial decisions and market inefficiencies.

Why do markets have bubbles?

Herd behavior, FOMO, and overconfidence drive prices far above fundamental value.

How can investors reduce behavioral biases?

Create rules-based strategies, diversify, avoid emotional decisions, and review holdings regularly.

Is behavioral finance proven?

Yes, decades of research show systematic psychological patterns affecting markets and individual wealth.