Measuring and Liquidity in the Application of Capital Asset Pricing Models that Vary in Time on Banking Shares

Oct 13, 2025 by wbrum.org 140 views

Measuring and Liquidity in the Application of Capital Asset Pricing Models that Vary in Time on Banking Shares

Introduction

The Capital Asset Pricing Model (CAPM) is a widely used framework in portfolio optimization for stock investment. However, this model has been subject to criticism, particularly with regards to its static beta nature and the need to consider other factors in determining stock returns. This study aims to investigate whether the effects of multifactor CAPM, such as company size (size) and liquidity, on excess return are influenced by time variations.

Background of the Study

The CAPM model assumes that the risk faced by investors can be measured by beta, which reflects the relationship between stock returns and overall market returns. However, in practice, beta tends to be static, so it does not always reflect changes in dynamic market conditions. This raises the need to include additional factors, such as size and liquidity, in stock return analysis.

Company Size and Its Impact on Stock Returns

Company size plays an important role in determining the potential return. Larger banks usually have better access to resources and are more stable in dealing with market fluctuations. Conversely, smaller banks may be more vulnerable to risk but have higher growth potential. The size factor, also known as SMB (small minus big), is a key component of multifactor CAPM models.

Liquidity and Its Impact on Stock Returns

Liquidity is very influential on the ability of investors to buy or sell shares without affecting prices. More liquid stocks tend to provide more stable returns, while lack of liquid shares can experience greater price fluctuations, depending on market conditions at that time. The liquidity factor, represented by Illq (illiquidity), is another important component of multifactor CAPM models.

Time Variation and Its Impact on Stock Returns

The time variation in this study provides valuable insights on how the influence of these factors can change from time to time. In the period of economic uncertainty or market volatility, there may be significant shifts in the relationship between size, liquidity, and excess return. By understanding this dynamics, investors can be better in formulating effective and responsive investment strategies to market changes.

Methodology

This study used a quantitative descriptive approach. The population studied included all commercial banks listed on the Indonesia Stock Exchange, with a total of 43 banks. From this population, the sample was taken using the purposive sampling method, produced 27 banks that were consistently registered on the Indonesia Stock Exchange during the 2012 to 2017. The data used was secondary data in the form of a monthly time series for 72 months.

Results

The results showed that the effect of risk premiums, company size (SMB), and liquidity (Illq) of excess return significantly influenced by time variations. This suggests that the multifactor CAPM model is a more accurate representation of stock returns than the classical CAPM model.

Conclusion

This study made an important contribution to the development of investment theory, especially in the context of the Indonesian stock market. The findings of this study provide valuable insights on how company size and liquidity can influence stock returns, and how time variation can impact the relationship between these factors. By understanding this dynamics, investors can be better in formulating effective and responsive investment strategies to market changes.

Recommendations

Based on the findings of this study, the following recommendations are made:

Investors should consider company size and liquidity as important factors in determining stock returns.
Investors should be aware of the time variation in the relationship between size, liquidity, and excess return.
Investors should formulate effective and responsive investment strategies to market changes.
Further research should be conducted to investigate the impact of other factors on stock returns.

Limitations of the Study

This study has several limitations, including:

The study only focused on commercial banks listed on the Indonesia Stock Exchange.
The study only used secondary data in the form of a monthly time series for 72 months.
The study did not consider other factors that may influence stock returns.

Future Research Directions

Future research should investigate the impact of other factors on stock returns, such as industry, market capitalization, and dividend yield. Additionally, future research should explore the use of alternative models, such as the Fama-French three-factor model, to determine stock returns.

Conclusion

In conclusion, this study provides valuable insights on how company size and liquidity can influence stock returns, and how time variation can impact the relationship between these factors. By understanding this dynamics, investors can be better in formulating effective and responsive investment strategies to market changes.
Q&A: Measuring and Liquidity in the Application of Capital Asset Pricing Models that Vary in Time on Banking Shares

Q: What is the Capital Asset Pricing Model (CAPM)?

A: The CAPM is a widely used framework in portfolio optimization for stock investment. It assumes that the risk faced by investors can be measured by beta, which reflects the relationship between stock returns and overall market returns.

Q: What are the limitations of the classical CAPM model?

A: The classical CAPM model assumes that beta is static, which means it does not always reflect changes in dynamic market conditions. This raises the need to include additional factors, such as size and liquidity, in stock return analysis.

Q: What is the role of company size in determining stock returns?

A: Company size plays an important role in determining the potential return. Larger banks usually have better access to resources and are more stable in dealing with market fluctuations. Conversely, smaller banks may be more vulnerable to risk but have higher growth potential.

Q: What is the role of liquidity in determining stock returns?

A: Liquidity is very influential on the ability of investors to buy or sell shares without affecting prices. More liquid stocks tend to provide more stable returns, while lack of liquid shares can experience greater price fluctuations, depending on market conditions at that time.

Q: How does time variation impact the relationship between size, liquidity, and excess return?

A: The time variation in this study provides valuable insights on how the influence of these factors can change from time to time. In the period of economic uncertainty or market volatility, there may be significant shifts in the relationship between size, liquidity, and excess return.

Q: What are the implications of this study for investors?

A: By understanding the dynamics of company size, liquidity, and excess return, investors can be better in formulating effective and responsive investment strategies to market changes.

Q: What are the limitations of this study?

A: This study has several limitations, including:

The study only focused on commercial banks listed on the Indonesia Stock Exchange.
The study only used secondary data in the form of a monthly time series for 72 months.
The study did not consider other factors that may influence stock returns.

Q: What are the future research directions?

A: Future research should investigate the impact of other factors on stock returns, such as industry, market capitalization, and dividend yield. Additionally, future research should explore the use of alternative models, such as the Fama-French three-factor model, to determine stock returns.

Q: What are the practical implications of this study for investors and practitioners in finance?

A: This study provides valuable insights on how company size and liquidity can influence stock returns, and how time variation can impact the relationship between these factors. By understanding this dynamics, investors and practitioners in finance can be better in formulating effective and responsive investment strategies to market changes.

Q: What are the contributions of this study to the development of investment theory?

A: This study made an important contribution to the development of investment theory, especially in the context of the Indonesian stock market. The findings of this study provide valuable insights on how company size and liquidity can influence stock returns, and how time variation can impact the relationship between these factors.

Q: What are the future applications of this study?

A: The findings of this study can be applied in various contexts, such as:

Portfolio optimization: Investors can use the findings of this study to optimize their portfolios by considering company size and liquidity.
Risk management: Investors can use the findings of this study to manage risk by considering the impact of time variation on the relationship between size, liquidity, and excess return.
Investment strategy: Investors can use the findings of this study to formulate effective and responsive investment strategies to market changes.