The objective of this paper is to give an overview of the most important movements of the complex area of asset pricing. This will be tried by logically structuring and building up the topic from its origins, the Capital Asset Pricing Model, and then over its main points of critique, in order to arrive at the different options developed by financial science that try to resolve those problematic aspects.
Due to the complexity of this subject and the limited scope of this paper, obviously it will not be possible to discuss each model or movement in depth. Coherently, the aim is to point out the main thoughts of each aspect discussed. For further information, especially concerning the deeper mathematical backgrounds and derivations of the models, the author would like to refer the reader to the books mentioned in this paper. Many of those works, finance journal publications and the literature on asset pricing in general, set their focus on different parts of this paper, which again underlines the complexity in terms of scientific scope and intellectual and mathematical intricacy of this topic.
Table of Contents
1 Introduction
1.1 Introduction to asset pricing
1.2 Objective of this paper
2 The Capital Asset Pricing Model
2.1 Derivation of the CAPM
2.1.1 Firm-Specific Risk vs. Market Risk
2.1.2 The beta coefficient
2.1.3 The CAPM Equation
2.2 The Security Market Line (SML)
2.3 Assumptions of the CAPM
3 Problems of the CAPM
3.1 Unrealistic assumptions
3.2 Empirical Testing of CAPM
3.2.1 General Testing Problems
3.2.1.1 The Problem of ex ante Data
3.2.1.2 Roll’s critique
3.2.2 Results of empirical Tests
3.2.2.1 Controversy about Beta
3.2.2.2 Empirical support for other risk factors
3.2.3 Conclusion
4 New Developments
4.1 Neoclassical Models – Traditional Asset Pricing
4.1.1 ‘Smaller’ adjustments of the CAPM
4.1.1.1 Zero-Beta CAPM
4.1.1.2 Introducing taxes and transaction costs
4.1.1.3 International Capital Asset Pricing Model
4.1.1.4 Option pricing in CAPM context
4.1.2 Multi-factor Models
4.1.2.1 The Arbitrage Pricing Theory (APT)
4.1.2.2 Fama-French Three-Factor Model
4.1.3 Multi-period models
4.1.3.1 The intertemporal CAPM (ICAPM)
4.1.3.2 The Consumption-Based CAPM (CCAPM)
4.1.3.3 Production-based Asset Pricing Model
4.1.4 General Puzzles of Traditional Asset Pricing Models
4.1.4.1 Equity premium puzzle
4.1.4.2 Risk-Free Rate Puzzle
4.2 Behavioral Finance
4.2.1 Introduction
4.2.2 Evidence contradicting the efficient market
4.2.2.1 Royal-Dutch-Shell shares
4.2.2.2 IPO Palm
4.2.3 Pillars of Behavioral Finance
4.2.3.1 Psychology
4.2.3.2 Limits to arbitrage
4.2.3.3 Summary
4.2.4 Prospect-Theory Model
4.2.4.1 Key Elements
4.2.4.2 Assessment
4.2.5 Habit Formation Models
4.2.6 Models with heterogeneous Agents
4.2.7 Conclusion
4.3 Chaos, synergetic models and neural networks
5 Conclusion
Objective and Thematic Focus
The primary objective of this paper is to provide a structured overview of the evolution of asset pricing theory, beginning with the foundations of the Capital Asset Pricing Model (CAPM) and extending into contemporary critiques and alternative theoretical developments. It addresses the fundamental risk-return tradeoff and evaluates why traditional models often fail to explain empirical market phenomena.
- The theoretical foundations and limitations of the Capital Asset Pricing Model (CAPM).
- Empirical critiques of the CAPM and the existence of persistent market "puzzles."
- Neoclassical adjustments, including multi-factor models like APT and Fama-French.
- The shift toward Behavioral Finance and the role of psychological bias in asset pricing.
- Advanced, non-linear approaches such as chaotic systems and neural networks.
Excerpt from the Book
2.1.2 The beta coefficient
But if one will always be stuck with the market risk and the firm specific risk will not play an important role in a diversified portfolio, does that mean that all assets are equally risky? No, because not all assets react the same way on changes in the market. Thus, there are assets that might only be slightly affected by changes in the market and others that depend to a high degree on the market development and will, therefore, react strongly to a changing market. (Weston et al., 1996, p, 201)
This leads us to the central aspect of the CAPM, namely the beta coefficient. It is a measure of nondiversifiable risk, so it measures the “degree of an asset’s return in response to a change in the market return.” (Gitman, 2006, p. 247) Although the beta should be forward-looking and compared to the whole market return, in practice it is usually based on historical returns and a common stock index as a proxy for the market return (Gitman, 2006, p. 247).
Chapter Summaries
1 Introduction: This chapter defines the core objective of the paper, focusing on the risk-return tradeoff and the historical significance of the CAPM in financial management.
2 The Capital Asset Pricing Model: This section explains the derivation of the CAPM, the role of market risk, and the rigid assumptions required for the model to function.
3 Problems of the CAPM: This chapter analyzes the discrepancies between theoretical assumptions and empirical reality, highlighting Roll's critique and the limitations of historical data.
4 New Developments: This section discusses the evolution of asset pricing models, ranging from neoclassical multi-factor models to behavioral finance and non-linear, chaotic approaches.
5 Conclusion: The concluding chapter summarizes the limitations of current models and suggests that while no perfect replacement for the CAPM has emerged, the field continues to evolve in complexity.
Keywords
CAPM, Asset Pricing, Beta Coefficient, Market Risk, Efficient Market Hypothesis, Behavioral Finance, Prospect Theory, Arbitrage, Fama-French, Equity Premium Puzzle, Multi-factor Models, Risk Aversion, Portfolio Theory, Neoclassical Models, Financial Economics.
Frequently Asked Questions
What is the primary focus of this paper?
The paper examines the evolution of asset pricing theory, tracing its roots from the CAPM through various critiques and modern developments, including behavioral finance.
What are the central themes explored?
Key themes include the risk-return relationship, the validity of market efficiency, the challenges of empirical testing, and the integration of psychology into asset pricing.
What is the main objective of the author?
The goal is to logically structure the development of asset pricing from the CAPM to newer models that attempt to resolve traditional failures in explaining market reality.
Which methodologies are discussed?
The author discusses linear multi-factor models, consumption-based models, behavioral finance frameworks, and non-linear dynamic approaches like neural networks.
What does the main body address?
It addresses the derivation of the CAPM, its empirical failures (puzzles), and subsequent improvements like the Fama-French Three-Factor model and prospect theory.
Which keywords best describe this work?
Keywords include CAPM, Behavioral Finance, Risk Premium, Market Efficiency, Beta, and Arbitrage.
What is the "Equity Premium Puzzle" mentioned in the text?
It refers to the empirical finding that historical stock market returns are significantly higher than what can be explained by standard consumption-based models given reasonable levels of investor risk aversion.
How does Behavioral Finance challenge traditional models?
Behavioral finance denies the assumption of fully rational market participants, arguing instead that psychological biases and systemic errors significantly influence asset prices.
What role does the "Beta coefficient" play?
Beta serves as a measure of an asset's nondiversifiable market risk, dictating its required return relative to market changes within the CAPM framework.
Are neural networks currently a viable solution for asset pricing?
While theoretically promising for capturing non-linear dynamics, the text notes that their practical application is complex and often leads to unsatisfactory forecasting results.
- Quote paper
- Manuel Kürschner (Author), 2008, Limitations of the Capital Asset Pricing Model (CAPM), Munich, GRIN Verlag, https://www.grin.com/document/92947
