Behavioral Finance. The Influence of Psychological Effects on Investor Behavior

Table of Contents

1 Introduction

1.1 Problem definition and question

1.2 Structure of the paper

2 Traditional capital market theory

2.1 Market efficiency hypothesis

2.2 The model of "homo oeconomicus"

3 Behavioral Finance

3.1 Anomalies of human behavior

3.1.1 Information perception anomalies

3.1.2 Information processing anomalies

3.1.3 Decision anomalies

3.2 Findings from brain research

3.3 Influence of moods

3.4 Influence of stress

3.5 Attitude and expectations

3.6 Motivation

4 Psychological effects in stock exchange trading

4.1 Anomalies in decision-making behaviour

4.1.1 Theory of cognitive dissonance

4.1.2 The status quo bias

4.1.3 Avoiding disappointment (regret aversion)

4.1.4 Illusion of control

4.1.5 Learned carelessness and learned helplessness

4.2 Perception of profit and loss

4.2.1 Prospect theory

4.3 Investor risk behaviour

4.3.1 Weighting of probabilities

4.3.2 Risk management

4.3.3 Illusionary Correlations

4.3.4 Risk return paradox

4.3.5 Reflection and framing effects

4.4 Overreactions

4.4.1 Excessive self-confidence (over confidence)

4.4.2 Herd behavior (Herding)

4.4.3 Fear and greed

5 Summary and outlook

Objectives and Research Focus

This paper examines how psychological anomalies and behavioral factors, beyond the traditional rationality assumptions of capital market theory, influence investor decision-making. The primary research question addresses which specific psychological effects lead to irrational investor behavior, particularly during volatile boom and crash phases of the stock market.

• Analysis of the limitations of the traditional "homo oeconomicus" model in financial decision-making.
• Exploration of human behavioral anomalies in information perception and processing.
• Evaluation of psychological drivers such as moods, stress, and overconfidence on trading patterns.
• Investigation of key phenomena including prospect theory, cognitive dissonance, and the fear-greed cycle.

Excerpt from the Book

Summary of Chapters

1 Introduction: Introduces the research topic by questioning the rationality of financial markets and defining the scope of the study regarding behavioral finance.

2 Traditional capital market theory: Reviews the classical model of the "homo oeconomicus" and the market efficiency hypothesis, highlighting their reliance on rational decision-making.

3 Behavioral Finance: Defines behavioral finance and discusses systematic anomalies in human behavior regarding information perception, processing, and decision-making, including the role of brain research.

4 Psychological effects in stock exchange trading: Details specific psychological triggers—such as cognitive dissonance, prospect theory, and herd behavior—that cause irrational reactions and market volatility.

5 Summary and outlook: Synthesizes the findings, confirming that psychological factors are essential to understanding market behavior and provide a necessary supplement to technical analysis.

Keywords

Behavioral Finance, financial market, stock exchange, investor, investor behaviour, psychological effects, anomalies, boom, crash, profit, loss, decision-making, risk, prospect theory, overconfidence.

Frequently Asked Questions

What is the fundamental focus of this thesis?

The work focuses on how psychological factors and human behavioral anomalies impact investor decision-making, often causing market participants to act irrationally in ways not predicted by traditional capital market theories.

What are the central themes discussed in the paper?

The paper covers the transition from traditional rationality models to behavioral finance, the influence of internal states like mood and stress, and the role of cognitive biases such as herd behavior and overconfidence.

What is the primary research question?

The research aims to identify which specific psychological effects lead to irrational investor behavior and exert the strongest influence on market outcomes, particularly during extreme market phases like booms and crashes.

Which scientific methodology is applied?

The work utilizes a literature-based analysis of the "Behavioral Finance" theory, drawing on psychological research and existing academic studies to explain investor behavior as a supplement to fundamental and technical analysis.

What topics are covered in the main section of the book?

The main section investigates information perception anomalies, brain research findings regarding financial investments, and specific trading effects like the disposition effect, prospect theory, and the fear-greed cycle.

Which keywords best characterize this research?

Key terms include Behavioral Finance, investor behaviour, psychological effects, anomalies, prospect theory, risk management, and the fear-greed cycle.

How does the "status quo bias" specifically affect financial markets?

Investors often stick to existing knowledge and consolidated opinions, paying less attention to new information if they perceive the consequences of an alternative to be more incalculable than the current state, leading to inactivity.

What does the "fear-greed cycle" represent in the context of the stock market?

It represents the cyclical emotional behavior of market participants—ranging from the euphoria and greed that drive prices up to the fear and panic that result in mass sell-offs and downward spirals.

Why is the "Sunk Cost Effect" particularly dangerous for investors?

It leads investors to hold onto losing positions too long or even repurchase losing stocks to "lower the average price," often justifying past mistakes instead of objectively investing in more profitable opportunities.