Research Article  Open Access
Mengyun Wu, Muhammad Imran, Linrong Zhang, Qi He, Allah Yar, "An Empirical Analysis of FirmSpecific Factors and Equity Premium: Evidence from Manufacturing Sector of Pakistan", Mathematical Problems in Engineering, vol. 2020, Article ID 1346053, 9 pages, 2020. https://doi.org/10.1155/2020/1346053
An Empirical Analysis of FirmSpecific Factors and Equity Premium: Evidence from Manufacturing Sector of Pakistan
Abstract
Equity premium is a vital number in finance to be considered for making fund allocation and investment decisions. This study explores the relationship between (controllable) determinants of firmlevel equity premium in the context of Pakistan stock market. We use a sample of 306 firms’ annual data, from 01/2001 to 6/2017, using a twostage leastsquares method to estimate our model. During the selected sample period, the average market premium of the Pakistan stock exchange (KSE100 Index) was twenty percent. The average equity premium of individual firms was only eight percent. Company fundamentals are considered determinants of firmlevel equity premiums. Panel data econometrics techniques were used to estimate the modified version of the multifactor model for the Pakistan Stock Exchange. It is found that the market premium, return on equity, dividend payout ratio, accounts receivable, and firm size significantly and positively affect the firmlevel equity premium. However, increase in the debttoequity ratio and quick ratio negatively affects that premium. The company fundamental variables are controllable for the firms and can be improved by company management to encourage investors and maximize shareholder wealth.
1. Introduction
One of the most pressing, contemporary topics in advanced corporate finance and financial economics is the equity premium and the magnitude of that equity premium in total returns. The equity premium is the additional return that investors require from investing in riskier stocks rather than in riskfree securities. The risk premium drives the total expected stock returns and is a key determinant of the cost of equity. Fama and French [1] define the equity risk premium as the difference between expected market portfolio return and the riskfree rate of return. Similarly, according to Mehra and Prescott [2], the difference between the market portfolio of stock and the riskfree interest rate is excess return, and this is called the equity premium.
Damodaran [3, 4] has stated that the stock risk premium is a central figure on which investors insist for a high return from investing in the stock market because the stock market risk is higher than the money market risk. Based on theoretical assumptions, the equity premium is the reward for taking that higher risk. It is a major factor for investors in estimating the total expected return of venture capital investment demand. It is also an important contribution to the valuation of corporate finance and market securities. Recently, Damodaran [4] stressed the importance of previous equity risk premiums and conducted empirical studies using data from 1926 to 2015. It was found that the average equity premium during this period was only 3.68%, with SD of 1.91%.
Equity premiums are estimated in many asset pricing models, such as APTs, threefactor models, and multifactor models. Many studies have validated the Capital Asset Pricing Model (CAPM), which is the origin of the equity premium in various capital markets [5–7]. The preliminary empirical test of CAPM predicts a positive statistically significant intercept term and concludes that the CAPM corresponds to the expected return of the market. The CAPM also has a linear relationship with the actual calculated return of the market portfolio.
While studying the drivers of the equity premium, one cannot ignore the importance of noneconomic factors that affect stock returns in general and equity premiums. In particular, Chen and Siems [8], Chesney et al. [9], Aisen and Veiga [10], Essaddam and Karagianis [11], Mnasri et al. [12], Okafor [13], Apergis and Apergis [14], Hobbs et al. [15], and Mnasri and Nechi [16], inter alia, have studied the impact of noneconomic factors such as political corruption, law and order, government regime changes, and political stability on stock market returns and equity premiums. Macroeconomic and noneconomic factors are beyond the control of fund managers and firm managers. Investors need to diversify their investment to minimize their risk, and the firm needs to make necessary changes that respond to changes in macro and noneconomic factors.
In Pakistan, a number of related studies [17–20] address stock market returns, their implications, determinants, and the interrelation with global markets. However, to the best of the authors’ knowledge, there are very limited number of studies on market premiums and none on firmlevel equity premiums. Research into the firmlevel equity premium, its size in total expected returns for individual assets, its estimation, importance, and the equity premium determinants remain scant in the literature.
2. Literature Review
The most popular fund allocations and investment decisions were based on meanvariance analysis. Markowitz [21] and Tobin [22] introduced the meanvariance rule. This seems to have been the first and most used investment allocation tool to address uncertainty in economics and finance. It has been broadly used by academics and investment practitioners. The same meanvariance analysis framework is the basis of Sharpe’s [23] and Linter’s [24] CAPM, which is the cornerstone of today’s modern economics and finance and other theoretical models. Blanchard [25], Lamont [26], Fama and French [1], and Gordon and Halpern [27] examined company fundamentals using a dividend growth model and concluded that changing price earnings ratios and dividends can also change the magnitude of the equity premium, which translates into a decrease in the total expected rate of return. They also concluded that dividends and price earnings ratios are the most basic company fundamental factors that affect the equity risk premium. Mehra and Prescott [2], Haque and Sarwar [28], and Imran et al. [29] argue that the equity risk premium is important for making various decisions such as portfolio allocation decisions, in deciding about the cost of capital, for determining the compensation for investing social security funds in the equity market, and many more such applications. Glassman and Hassett [30] state that equity premiums arise from errors. They further argue that the change in the riskfree rate produces the premium. When interest rates increase, the equity premium tends towards zero. These studies are mostly related to market premiums rather than firmlevel equity premiums. Our study is different in that we examine the impact of company fundamentals on firmlevel equity premiums, which is poorly represented in the available literature.
Fernandez [31] conducted a survey and received responses from 85 countries, including Pakistan; the survey asked about the required market risk premium (MRP). The average MRP reported for Pakistan was 6.3, with a standard deviation (SD) of 2.3; the study concluded that Pakistan is a developing capital market. The discount rate was not statistically significantly correlated with the developed world, especially Western Europe and the United States. Therefore, most of the macroeconomic and monetary economic indicators do not adequately explain the situation of the Pakistan stock market return, and in fact this is true for all developing economies. “The country has a very large undocumented sector and very limited tax base, and its policies—for the most part—are not set independent of international political pressures” [31]. We predict from these studies that the equity premium of the Pakistan stock market is not properly calculated in any empirical study nor have its determinants been examined.
In the equity premium survey, Fernandez [31] reported considerable variation in equity premiums across economic analysts within the same stock market. In the United States, for example, the average equity risk premium across analysts was 5.8%. However, the numbers produced by different academic and economic experts ranged from 3.2% to 10.5%. Therefore, an extensive investigation of the market equity premium, as well as of firmlevel equity premium, is of paramount importance. Company fundamentals, as determinants of the firmlevel equity premium, will open avenues for further research into this topic for future decision making that will be relevant to internal factors of firm performance.
Since we know that the company’s risk should be determined by a combination of the fundamentals and the market characteristics of the company’s stock, this study differentiates itself from earlier studies by taking into account the firmlevel equity premium with its internal risks of its fundamentals. This is important to study because company fundamentals are controllable and the firm’s management can take any necessary action to improve them and encourage investors.
3. Model
Equity premium can be modelled using different asset pricing models such as CAPM, APT, the threefactor model, and multifactor models. Markowitz [21] was the first to provide the basis of the risk and return theory. Markowitz’s theory was further developed and constructed into the CAPM by Tobin [22], Sharpe [23], Linter [24], and Mossin [32]. The CAPM was criticised for its singlefactor measure, which gave birth to Arbitrage Pricing Theory [33], followed by the threefactor model [34, 35] and the multifactor model [1]. Relevant to the different degrees of risk, macrobased and microbased risk factor models were also developed accordingly. However, there remains room to add new phenomena of company fundamental factors in order to evaluate the association between the equity premium and its possible determinants. In this study, we will use a modified version of Fama and French’s [1] multifactor model to examine the effect of company fundamental variables (i.e., market premium, liquidity, solvency, efficiency, and size) on firmlevel equity premiums in Pakistan. The model is explained in the following formula:where is the firmlevel equity premium, is the market premium, is return on equity, is the quick ratio proxied for liquidity of the firm, is the dividend payout ratio, DER is the debttoequity ratio, ART is the accounts receivable turnover in days, Size represents the firm size, which is calculated as the log of total assets, and is the error term.
Previous studies [1, 4, 35, 36] considered variables such as growth, size, momentum, and macroeconomic factors. However, the companyspecific microvariables are also used as technical indicators for investment decision making. Changes in investor preferences are also caused by the company’s fundamental performance. This enables the firm to take necessary measures and to improve them because these factors are avoidable and they can be controlled by the firms themselves. MP represents the trend of the overall market. When the market premium increases, this means that investors are investing in different market portfolios, which result in increases in EP of firms. Therefore, the expected sign of the coefficient of MP is positive, i.e., . ROE also provides the magnitude of the return on equity, which encourages (or discourages) investors to invest in those particular firms. Thus, the sign of the coefficient is expected to be positive, i.e., . Similarly, increases in the value of DPR, ART, and Size encourage investors in that particular firm and the expected sign of the coefficient of these variables will be positive, i.e., , , and . In turn, the effect of QR and DER on the firm’s equity premium is expected to be negative. Thus, the expected sign of the coefficient is negative, i.e., and .
3.1. Econometric Methodology
3.1.1. Data Collection and Research Methodology
This study selects 306 nonfinancial firms listed on the Pakistan Stock Exchange. This selection is made by keeping in view the liquidity of listed firms. Table 1 shows the descriptive statistics.

The data have been collected from reliable sources of the PSX official website (http://www.kse.gov.pk), business recorders, and economic surveys of Pakistan. The company fundamental variables, i.e., accounting data, are collected from the balance sheet analysis compiled by the State Bank of Pakistan. These are the most reliable sources of such financial information.
The following section discusses the methodology used for the estimation of the relation of the equity premium and its determinants. The study uses the assumption of continuous returns for the KSE100 Index and the asset prices of each firm. The continuously compounded returns formula is expressed as follows:where is the compounded return, is the price of asset at period and is the price of assets at the period
After calculating the returns of the KSE100 Index and firm assets, we can calculate the equity premium by taking the difference of market return and riskfree interest rate following the Fama and French [1] method:where is the equity premium, is the return of the market, and is the riskfree rate of return.
3.2. Panel Data Econometrics
Panel or longitudinal data are a dataset which comprises repeated measures of a given sample or same variable over time, such as individuals, firms, persons, cities, and countries that are observed at numerous points in time such as days, months, quarterly, or years before and after treatment [37]. In the literature, it is known by various terms, such as pooled data, micropanel data, a combination of time series and cross section data, longitudinal data, and cohort analysis. Panel datasets are divided into micro and macropanel datasets and balanced and unbalanced panel datasets. Micropanel datasets are those for which the time dimension, , is of less importance than the dimension of individual , while for macropanel data, the dimension of time and the individual are similarly important. A panel dataset is called balanced if it has the same time intervals, , for each cross section observation; for an unbalanced set, the time dimension is specific to each individual [37].
The general model for panel data can be written aswhere , is the dependent variable (in our case, we consider it as the firmlevel equity premium), as usual is the intercept and independent from , is the vector of the unknown parameter to be estimated, is the vector of explanatory variable observations, and is the disturbance or error term.
The basic type model that can be estimated using the panel technique can be written as the following function:
The most important case concerns the linear conditional mean specification so that we have the following functions:where is the dependent variable, is a of regressors, and are the random error terms for crosssectional units observed for dated periods, i.e., . The α parameter indicates the overall constant in the above stated model, while the and represent the cross sections for each periodspecific effects (random or fixed). Random effect and fixed effect are the two most used methods for the analysis of crosssectional datasets. However, generally there are three basic estimation models of panel data.
A decision to choose between the random effect model and the fixed effect model will be checked by using the Hausman test.
In order to estimate the model used in this study, we applied the twostage leastsquares (2SLS) method. The estimation of the model is not appropriately undertaken by using the simple ordinary leastsquares method because the problem of possible endogeneity of the variables can cause the leastsquares estimators to be biased and contradictory. Endogeneity is expected to occur mainly due to reverse causality between the independent variables (such as inflation and money supply); these samenature variables are therefore likely to be correlated with the error term. To find reliable parameter estimates in panel data, we apply the twostage leastsquares estimation technique. This is based on the standard of variables used as instruments. In the presence of instrumental variables, two standard approaches to endogeneity in panel data are the panel twostage leastsquares (TSLS) estimator (e.g., among others, [38, 39]) and the panel limited information maximum likelihood (LIML) estimator. Hence, in order to avoid the endogeneity problem, we use the TSLS (instrumental variables) to estimate our panel dataset.
3.3. The Hausman Test
The Hausman test is a standard method used in observation panel data analysis to distinguish between fixed effects and random effects models. This was used by Durbin and Stuart [40] and received good data analysis results. Therefore, an assessment test based on two sets of parameter estimates is called the Durbin–Wu–Hausman test, or DWH. For ease of description, we will refer to it as the Hausman [41] test.
The general procedure can be described as follows. We presume that we have two types of estimators for a certain factor of element . One of them, , is robust, i.e., reliable under both the null and alternative hypothesis. One of is capable and reliable under the null hypothesis , but inconsistent under the alternative . The variations between both the estimators are then used as the basis for testing the analysis. The Hausman test indicates that under appropriate assumptions, under , the statistic h based on has a limiting chisquared distribution: .
If this value lies in the upper tail of the chisquared distribution, we reject our null hypothesis H_{0}: if the variance matrix is consistently analyzed and estimated, the test will have more power against any other alternative under which is robust and is not robust.
The Hausman procedure also shows that, again under certain appropriate assumptions,
It is well known that the assumptions used are sufficient but not necessary. Further, while it may be convenient to estimatethis may be more robust and the tradeoff between its robustness and power should be considered appropriately. The Hausman specification test for error components provides guidance on whether . The key idea is that ifthen the inconsistent random effect estimator and the consistent fixed effect estimator converge to different estimates. If , then the unobserved heterogeneity is uncorrelated with X and does not create a base. Random effect and fixed effect are both consistent. However, the Hausman test can draw us away from using random effects in the existence of an outsized bias, but there remains room for substantial efficiency gains in switching to random effect.
4. Results and Discussion
This section explains the effect of company fundamentals on the firmlevel equity risk premium. Company fundamental variables include market premium, ROE, QR, DER, DPR, ATR, and size of the company. Each of these variables has 4284 observations.
4.1. Summary Statistics
Table 1 presents the descriptive statistics for the company fundamental variables used in this study. The results of these summary statistics include mean, minimum, maximum, standard deviation, skewness, and kurtosis.
These descriptive statistics show that the mean value of equity premium is 0.045, with a range of −3.86 to 5.39% with a standard deviation of 0.60. The mean of the market premium is 0.19, with a range of −1.01 to 0.71% with a standard deviation of 0.39. Return on equity (ROE) has the lowest mean of 0.007, ranging from as low as −324.64 to 28.93, with a high standard deviation value of 5.17. The rest of the variables can also be interpreted in the same way. Size of the firm is an important component and has the highest mean of 7.35, with a range of −0.11 to 12.76; this is followed by dividend payout ratio, which is also an important number in calculating the total return from an investment by investors and is followed by the mean of debttoequity ratio, i.e., 1.48. The standard deviation of debttoequity ratio is the highest, at 41.86, followed by the standard deviation of dividend payout ratio, return on equity, and quick ratio.
Table 2 presents the results of the correlation matrix of the company fundamental variables. Values of correlation coefficients indicate that the market premium has a positive but insignificant correlation with ROE, debttoequity ratio, and accounts receivable turnover in days. However, it has a positive and significant relationship with QR. The market premium has significant negative correlation with size and negative but insignificant correlation with DPR. ROE is positively but insignificantly related with QR and dividend payout ratio; however, its positive and significant correlation is recorded with ATR. ROE shows a negative relationship with DER and Size but no negative significant correlation of ROE is recorded with other factors. The QR shows an insignificant positive correlation with DER, a negative insignificant relation with DPR, and a negative but significant correlation with Size. DPR shows a positive and significant correlation with ATR and Size and a negative and insignificant correlation with DER. The factor DER has a positive relation with ATR and a negative relation with Size, but both values are statistically insignificant. In addition, ATR shows a negative and significant correlation with Size.

Table 3 presents the Kolmogorov–Smirnov test; the results demonstrate that value of the Kolmogorov–Smirnov test is greater than 0.05 which suggests that the data pattern of equity premium in our sample is normal. The same normality trend is also obtained by constructing a histogram (Figure 1).

To examine the structure break in the equity premium data, we have divided the data into two periods: before and after the 2008 global financial crisis. Period 1 consists of data from January 2001 to July 2008; period 2 consists of data from August 2008 to June 2017. Period 2 contains the crisis period, followed by the normal bullish market trend. A paired ttest is applied to check the differences of equity premium before and after the 2008 financial crisis. Table 4 presents the paired ttest results.

The results show that two pairs of equity premium are weakly and positively correlated (r = 0.243, ), since the value of tstatistics is insignificant (0.836), which implies that null hypothesis is accepted, i.e., there is no significant difference in returns before and after the global financial crisis.
4.2. Estimation and Interpretation of Results
We can estimate our model by the fixed effect or random effect technique in panel data econometrics, the most extensively used techniques. In order to select between them, we used the Hausman test, the most widely used technique for that selection. We estimate the following model by using the panel data for our sample variables for the period of January 2001 to December 2015:
The model can be expressed in more compact form as follows:
The independent variables are the company fundamentals. The others are as described earlier.
Table 5 presents the Hausman test results. The statistically insignificant value of the Hausman test indicates that the random effect is better than the fixed effect model.

We use the TSLS (instrumental variables) to estimate our panel dataset, a widely used technique for avoiding the problem of endogeneity [38, 39, 42]. The estimated results from the model are reported in Table 6. The results show that the market premium has a positive and statistically significant impact on the firmlevel equity risk premium. The value of the coefficient implies that a 1% increase in the market premium will increase the firmlevel equity premium by 0.55%. The coefficient of the ROE is statistically significant and positive, which indicates that when the ROE increases by 1%, the firmlevel equity premium will increase by 0.003%. The findings are consistent with previous studies. The coefficient of the QR is positive, which implies that quick ratio has a positive impact on equity premium. However, the coefficient of QR is statistically insignificant. The coefficient of the DPR is positive and statistically significant. This indicates that a 1% increase in DPR will increase the firmlevel equity premium by 0.001%. The statistically significant coefficient of the ATR indicates that a 1% increase in ATR will increase the firmlevel equity premium by more than 0.02%. These results are consistent with previous studies [1, 4, 43]. Size also has a statistically significant and positive relationship with ERP. However, economically speaking, the magnitude of the coefficient is low, which implies that the firmlevel equity premium is not very dependent upon the size of the firm.
 
Note. , , and indicate that the variable is significant at 1%, 5%, and 10% levels of significance. 
The value of the coefficient of determination (R^{2}) shows that a more than 19% deviation in the model is explained by the explanatory variables. Similarly, the value of adjusted R^{2} implies that the 19% variation in firmlevel equity premium is explained by the model. The value of Fstatistic is statistically highly significant, which implies that there is no problem in analyzing the data by way of the proposed model and technique. The DW statistic value is close to the benchmark value of 2, which confirms that there is no problem of autocorrelation in the data. The instrument rank value used in this model is 322. The validity of the instrument rank was checked by Jstatistic. The statistically insignificant value of Jstatistic indicates that the instruments are valid.
Table 7 shows the sensitivity analysis of the model. We ran the same model for different combinations of variables one by one. The results are given in columns. This shows that the signs and the significance of these variables remain the same.
 
Note. , , and indicate that variable is significant at 1%, 5%, and 10% levels of significance. 
For the single variable model presented in column 2, the value of the coefficient of determination (R^{2}) is only 11%. As the number of variables increases, the value of the R^{2} also increases up to 18%. Other values that show the fitness of model and data remain intact as the benchmark of these values.
5. Conclusion and Recommendation
This paper quantifies the impact of company fundamentals on the firmlevel equity premium in an emerging market, Pakistan, using a panel data technique for 306 nonfinancial firms listed on the Pakistan Stock Exchange for the period January 2001 to December 2015. The company fundamental factors included profitability, liquidity, dividends, solvency, efficiency, and size. Based on the literature, we selected proxies for measuring company fundamentals of return on equity, quick ratio, dividend payout ratio, debttoequity ratio, account receivable turnover ratio, and size, as company fundamental variables as determinants of the equity premium. The company fundamentals are the controllable factors for companies and can be revisited by companies if they affect company returns.
The CAPM is not valid for the valuation of securities in the PSX. Therefore, in this study, we develop an extended version of Fama and French’s [1] model, which contains seven company fundamentals, in order to test the effects on the equity premium. First, we checked the normality of the dependent variable using the Kolmogorov–Smirnov test; the results reveal that the data are normal. The results of the paired ttest indicate that there is no significant difference in the pre and post2008 global financial crisis periods. The estimated results of the equity premium and the fundamental variables show that five out of seven company fundamentals significantly affect the equity premium. These variables are the market premium, return on equity (ROE), the dividend payout ratio (DPR), the accounts turnover ratio (ATR), and the size of the firm. Of these five variables, the market premium, the dividend payout ratio, and the accounts receivable turnover have a positive, significant effect on the firmlevel equity premium at a 5% level of significance. However, ROE and size have positive and statistically significant effect on the firmlevel equity premium at a 10% level of significance. This implies that an increase in the market index, high dividend payment, and good cash inflows increase the market value of individual stocks, which generates a high premium. The results also reveal that the quick ratio (QR) has a positive effect and debttoequity (DER) ratio has a negative, but statistically insignificant, effect on the firmlevel equity premium.
The paper has some important implications for policy makers. The firm’s managers can manage these company fundamentals in the best interests of the company in order to maximize shareholder wealth. But fund managers need to observe company fundamentals before making any investment decision as to an individual firm’s stocks. It is also evident for policy makers that an increase in the interest rate leads to a decrease in the equity premium. Therefore, policy makers need to control interest rates in order to encourage stock market investment domestically and internationally.
Data Availability
The data used to support the findings of this study are available from the corresponding author upon request.
Conflicts of Interest
The authors declare that there are no conflicts of interest regarding the publication of this paper.
Acknowledgments
The authors take this opportunity to thank the academic editor Antonio M. Lopes and annoymous reviewers for giving us valuable and insightful suggestions to improve the quality of our paper. The authors also acknowledge the financial support for this research by the National Natural Science Fund (71572071), National Social Science Foundation (19BGL127), Research and Practice Project of Teaching Reform of Graduate Education in Jiangsu Province (JGZZ1_056), and Advanced Talent Project of Jiangsu University (09JDG050 and 14JDG202).
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Copyright © 2020 Mengyun Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.