Determinants of WCM of Indian listed firms: A GMM regression approach

Abstract This research paper purposes to discover the reasons that impact the working capital management (WCM) of Indian-listed manufacturing firms. The study uses a panel data set of 291 firms covering years from 2011 to 2020. The authors use working capital requirement (WCR) and cash conversion cycle (CCC) as proxies for working capital management and assess the effect of operating cash flow (OCF), performance as return on assets (ROA), valuation as Tobin’s Q (TQs), size, age, growth opportunities, leverage, and economic condition as the gross domestic product (GDP) over them. We use OLS and GMM estimators for the analysis of the study. Indian listed manufacturing firms’ cash conversion cycle (CCC) has been found to be positively correlated to their firm value, performance, and leverage. At the macro level, CCC is positively correlated to GDP. Further, CCC has been found to be negatively correlated with growth opportunities, operating cash flow, firm size, and age. The working capital requirement (WCR) of the firms, on the other hand, is positively associated with performance, firm age, and value, while it is negatively related to OCF, growth opportunities, leverage, size, and GDP. Our study adds uniqueness to the existing works on working capital in many ways. First, to our knowledge, very few studies exist to measure working capital management in the Indian context using two proxies WCR and CCC of working capital as dependent variables. Second, we used both OLS and GMM estimators to measure the explanatory variable’s effect over WCR and CCC which provided a more valid result. Third, we used eight factors as explanatory variables that provide a wider scope to explain the working capital management of Indian listed firms.


Introduction
Corporate finance decisions are either long-term or short-term decisions (Baker et al., 2017). Longterm financial decisions primarily deal with such topics as capital budgeting and capital structure. In contrast, short-term decisions relate to liquidity, especially working capital management (WCM), which focuses on the composition of a firm's current assets and current liabilities (Jamalinesari & Soheili, 2015). Sagner (2014), opined that a company's financial position is characterized by the optimal utilization of its working capital. And that the working capital influences profitability and liquidity. In the same way, the company's performance defines its profitability (Deloof, 2003;Hassan & Shrivastava, 2019;Shin & Soenen, 1998). Working capital management decisions influence companies' performance and influence companies' valuation.; So, working capital management has become central to a firm's short-term and long-term financial management (Enqvist et al., 2014;Talonpoika et al., 2016). Efficient WCM helps a firm to maintain its solvency, and avoid situations of financial distress, and is critical for a firm's long-term survival (Padachi & Howorth, 2014).
Most literature on corporate finance has been concentrated largely on long-term financial management and strategies but little attention was given to the important short-term financing decisions (de Almeida & Eid, 2014). Working capital is important in managing cash and accounts receivables (Yazdanfar & Peter, 2014) along with liabilities and liquid assets. It has been found that large businesses face liquidity challenges, particularly since the 2008 worldwide financial crisis. Despite the availability of several sources for raising funds, working capital has been a vital and active source of operations for manufacturing firms and has the potential to eliminate barriers in supply chain financing (Alora & Barua, 2019;Ghosh et al., 2021;Shenoi et al., 2018). The global financial crisis of 2008 has increased companies' alertness to unknot the valuable cash locked in the working capital cycle. A company's many loan contracts enable the company to maintain a necessary networking capital, influencing its capacity for debt financing. From 2010 onwards, most firms registered an increase in their management of working capital funds, although there was an enhancement in payables in comparison to receivables and inventories (Ernst and Young, 2011). However, the businesses also had billions in working capital tied up, showing a significant amount of their working capital range. For instance, as per REL/CFO Asia Magazine's report, $535 billion was blocked in working capital. Companies have billions tied up in working capital because the growing economies usually have troubles with the competent deployment of resources (Vijayakumar & Venkatachalam, 1996). The net rise in working capital is one factor influencing the shortfall in the fund balance, which influences the amount of debt issued (Shyam-Sunder & Myers, 1999). Besides, many studies have concluded that leverage has a strong influence on the working capital outlays of a company (Chiou et al., 2006;Kargar & Blumenthal, 1994). Other researchers identified certain company-specific factors such as growth trajectory, profitability, size, age, operating cash flow, and valuation to impact working capital management.
Generally, corporate finance is based on three main areas: capital structure, capital budgeting, and working capital malmanagement. Capital structure and capital budgeting were found a substantial portion of the research studies, whereas working capital management has been comparatively less attractive for researchers exploring research (Chiou et al., 2006). Furthermore, the WCM literature has conventionally intensive to know the relationship between a firm's working capital and its performance and less importance placed on the set of factors that outline firms' behavior (Nazir & Afza, 2009;Palombini & Nakamura, 2012). Subsequently, it has become clear that the financial manager role goes beyond simply finding the ideal levels of working capital and its components. Now finance managers have to figure out how various internal and external factors affect WCM. Our paper is a contribution to WCM literature which enables finance managers to know the determinants that influence WCM.
The purpose of our study was to find out the domineering source that affects the working capital management of Indian manufacturing companies. Our study makes several contributions to the literature on WCM. First, although India is considered to be one of the largest economies in the world, no published research has been found by authors purely based on the determinants of WCM for Indian firms. This omission clarifies why this research is contemptuously significant and inimitable. Our research determines working capital management through two proxies to working capital-working capital requirement (WCR) and cash conversion cycle (CCC) -while most studies used these dependent variables disjointedly. Third, to know the factors that influence the working capital of the firms, we used eight independent variables viz; operating cash flow (OCF), performance as return on assets (ROA), valuation as Tobin's Q (TQs), firm size, firm age, growth opportunities, leverage, and economic condition as the gross domestic product (GDP) that provide a wider scope to our study. Our study is anticipated to add new insights to the WCM area because the consequences are expected to give a better understanding of the influence of different internal and macroeconomic factors on WCM behavior. Also, finance managers can use the finding of different research to identify the relevant consequences of poor WCM (Prasad et al., 2019).So, we recommend essential actions for financial managers and senior management in Indian listed firms.
To achieve the purpose of our study, henceforth the structure of the paper is arranged in the following sequences. Section 2 investigates the preceding literature on WCM and its determinants. Section 3 portrays the research methodology and the analysis of data. Section 5 addresses the key findings of the research. And finally, section 6 discusses the conclusion and recommendation of the study. Singh and Kumar (2014) revealed in their study that the key issues with past WCM literature were a lack of systematic theory development study, which would open all new areas for future research. So, our study divides the literature review into two sections. The first section discusses the representative of WCM in form of its proxies and the other section reviews literature related to the factors impacting WCM.

Literature review
The literature on working capital can be determined by considering CCC and WCR (Akinlo, 2012).
Many researchers used WCR as a proxy of working capital to understand what factors influence WCM (Al-Talab et al., 2010;Cuong & Nhung, 2017;Gill, 2011;Nazir & Afza, 2009;Salawu & Alao, 2014;Wasiuzzaman & Arumugam, 2013;Çetenak et al., 2017). Hill et al. (2010) observed the effect of different firm-specific factors on working capital by taking a sample of 3,343 manufacturing firms from the US. The research concluded that while WCR has a positive relationship with firm size and OCF, it has a negative relationship with market-to-book ratio and financial crunch. In Canada, Gill (2011) examined the same with a sample of 166 Canadian firms and concluded that WCR is positively associated with business operating cycle and return on assets (ROA), and is negatively associated with growth opportunities and firm size. The working capital requirement is the net working capital (NWC) divided by the company's current assets. Where NWC is the difference between the current assets and current liabilities of the firm. Working capital indicates a company's liquid assets compared to its current liabilities and thus providing an insight into the short-term financial health of the firm. In this way, WC also indicates the operational efficiency of the firm. Goes without saying, if a company's working capital is good, it will grow, and on the contrary, if a company's working capital situation is not good, it may face financial troubles.
The cash conversion cycle can be used to measure the productivity of working capital management (Deloof, 2003;Manoori & Muhammad, 2012;Palombini & Nakamura, 2012;Rimo & Panbunyuen, 2010;Valipour et al., 2012;Zariyawati et al., 2010Zariyawati et al., , 2016. The cash conversion cycle is the "net inventory period" coupled with the "accounts receivable period" (ARP) and minus "accounts payable period". CCC and working capital management efficiency are inversely related, as low CCC indicates lower capital requirements leading to less opportunity cost, which in turn results in better cash flows that improve the financial health of firms (Banomyong, 2005). On the contrary, a longer cash conversion cycle results in higher opportunity costs and less working capital management efficiency.
When we look at India's manufacturing sector, there have been very few studies conducted, and even fewer in the international sense. 2006) used panel data analysis to examine 58 small manufacturing firms in Mauritius between 1998 and 2003 to conclude high working capital requirements lower profitability. Raheman, A., et.al (2010) studied 204 Pakistani manufacturing firms from 1998 to 2007 and discovered that CCC, Net trade cycle, and inventory turnover have a major impact on the firms' efficiency. Leverage, sales growth, and firm sizes had a positive impact on the company's profitability. 2012) researched Sri Lankan manufacturing firms from 2008 to 2011 and did not notice any meaningful relationship between CCC and performance measures. 2016) studied Indian manufacturing firms and showed that CCC was adversely related to the return on equity (ROE) but positively associated with the net profit ratio (NPR). 2011) shows that Canadian manufacturing firms' leverage and their firm value influence WCR. 2012) studied 75 manufacturing firms for the period from 2002 to 2009, which were listed on the Istanbul stock exchange, and found that shorter CCC and accounts receivable would increase the profitability of firms. Baños-Caballero et al. (2010) concluded that companies with greater potential to produce cash flows earmark higher working capital as it reduces the cost of short-term funds. This conclusion is in concurrence with Fazzari and Petersen (1993). On the Other hand, Baños-Caballero et al. (2014) suggest that companies with high cash flow tend to offer longer credit periods significantly increasing CCC, which negatively impacts WCM efficiency. Contradicting this, Chiou et al. (2006) find that firms with high cash flow have better working capital efficiency and possess higher net liquidity, which might result in shorter CCC. 2016), found that companies with cash flows less than the median of the sample have lower working capital investments, while companies with cash flows higher than the sample median have higher working capital investments.

Operating cash flow
The inverse relation between CCC and operating cash flow is concluded by various studies. Also, it is concluded that firms efficiently manage working capital will have longer CCC resulting in less operating cash flow (Manoori & Muhammad, 2012;Palombini & Nakamura, 2012;Rimo & Panbunyuen, 2010;Valipour et al., 2012;Zariyawati et al., 2016).
Hence, based on the above-stated literature, we develop the following hypotheses: H 1a . Operating cash flow is positively related to WCR. H 1b. Operating cash flow is negatively related to CCC. Blazenko and Vandezande (2003), opine that when businesses expect future earnings growth, the existing inventory level also rises proportionately to support higher sales. Cuñat (2007) concludes that when companies experience slower sales growth sources use their trade credit as a source of financing customers. Petersen and Rajan (1997) argue that firms provide more credit to customers in order to grow their sales, particularly during weak demand. Thus, growth potential seems to have a positive association with CCC. H 2a. Firm Growth is negatively related to WCR. H 2b . Firm Growth is negatively related to CCC.

Return on assets (ROA)
The study after reviewing the existing literature finds that a reduction in the invested amount of WC helps to achieve higher levels of profitability (Kayani et al., 20190. Better management of working capital and its components will improve firm efficiency i.e., low working capital requirements (Narender et al., 2008). Literature observed that WCR is positively related to firm performance (Abbadi & Abbadi, 2013;Al-Talab et al., 2010;Chiou et al., 2006;Cuong & Nhung, 2017;Narender et al., 2008;Nazir & Afza, 2009;Rehman et al., 2017;Saarani & Shahadan, 2012;Wiguna & Wasistha, 2017). Naser et al. (2013) show that shorter CCC, which can be used as a proxy to WCM efficiency, improves cash flows and thus profitability. This is in agreement with prior research by Uyar (2009), Haron and Norman (2016), Azami and Tabar (2016), 3), and Valipour et al. (2012). As a result, the third hypotheses and its variants are: H 3a . Performance is positively related to WCR. H 3b . Performance is negatively related to CCC.

Firm value
Efficient WCM reflects in the stock market performance of firms (Hill et al., 2010). He predicted in his study that the investors offer higher values to the stocks of the companies holding lower working capital ratios. Similarly, other researchers have shown that additional investment in the WCR level would reduce the company's value (Gill, 2011;Kieschnick et al., 2013). This results in a negative relationship between firm value and WCR. Also, shorter CCC indicates better management of working capital resulting in higher firm value.
The ratio of the net market value of the debt and equity in addition to book value divided by the book value of the company's total assets determines the company's value. According to 1996), Tobin's Q is used to measure firm value, since each measure of value in the above equation would have a different impact. Shin and Soenen (1998) concluded that the cash conversion cycle (CCC) calculates liquidity management that forecasts companies' funding needs, mainly in working capital. If CCC is lengthy, the company will have a low level of working capital investment. Thus, the fourth hypothesis and its variants are as follows: H 4a . Firm value is negatively related to WCR. H 4b . Firm value is positively related to CCC.

Age
The bond between the age of companies and the effectiveness of CCC has been observed by many studies. Mathuva (2013) investigated non-financial listed firms and could not find any significant link between the firm's age and CCC. According to Niskanen and Niskanen (2006), a firm's age determines the business's capacity to receive external financing and consequently influences working capital.
Since young companies have better growth prospects with less capital reserved, their age is expected to affect business liquidity positively. On the other hand, older companies acquire stability and hold more resources but few growth options, resulting in higher liquidity investment (Chiou et al., 2006). It has been found that older company develops a good relationship with their clients and suppliers, hence better controlling their inventory, reducing the need for working capital (Wasiuzzaman & Arumugam, 2013). So, the fifth hypotheses and its variants based on the literature, are as follows: H 5a. Firm age is positively related to WCR. H 5b . Firm age is positively related to CCC.
Works of literature showing a positive association between a firm's size and CCC is very few. Some of the studies predict large firms to be diverse with a better ability to raise capital and take advantage of trade opportunities with more trade credit periods (Niskanen & Niskanen, 2006). Contrary, small firms have more financial limits, and consequently, they attempt to reduce inventory levels in order to reduce CCC (Fazzari & Petersen, 1993;Petersen & Rajan, 1997). So, the size and CCC are positively associated with each other. But on the contrary, Baños-Caballero et al. (2010) observed negotiating power of firms to be directly proportional to their size, and hence, the CCC of large firms is shorter compared to small firms. Moreover, many empirical studies predicted the size of a firm has a detrimental impact on CCC (Mongrut et al., 2014;Rimo & Panbunyuen, 2010;Iftikhar, 2013;Zariyawati et al., 2010;Manoori & Muhammad, 2012;Haron and Norman, 2016;Valipour et al., 2012;Uyar, 2009

Gdp
The level of working capital requirement and economic conditions have been found correlated. Al Taleb et al., (2010), pointed out that the changes in the interest rates, which are a product of gross domestic product (GDP), impact working capital. Qurashi and Zahoor (2017) found a positive association between GDP and WCR. The findings suggested that general demand in a country will impact working capital requirements, in the other words GDP growth has a significant and positive influence on working capital. Goel and Sharma (2015) found an insignificant relationship between GDP with CCC. Based on the above arguments, the eighth hypotheses and its variants are as follows: H 8a . GDP is positively related to WCR.
H 8b . GDP is negatively related to CCC

Data and sample
For this study, balanced panel data of 291 Indian manufacturing firms, from the BSE 500 Index, has been gathered. Services oriented such as banks, and financial institutions are not included in the study as their working capital requirements are unique. Research data were collected from the Prowess Database for the period 2010-2020. The Prowess is one of the most reliable sources of data for Indian firms. Additionally, GDP-related data was obtained from the various bulletins released by the Reserve Bank of India. Variable descriptions are given in Table 1 and 2.

Methodology
Working Capital cannot be measured directly, so we used WCR and CCC as proxies. We used the following two equations (empirical models) to estimate dependent variables: Both these models were tested using panel data as Baltagi (2005) and Hsiao (2003) explain panel data offers more degrees of freedom, lower collinearity among variables, and offers better control for heterogeneity for individual variables. Thus, panel data is superior to other methodologies.
Balanced panel data of 291 companies in the manufacturing sector for 2010-2020 was used for this study. Further, the above empirical models were tested to check the endogeneity, multicollinearity, heteroskedasticity, and serial correlation.
The variance inflation factor (VIF) and tolerance values are calculated under collinearity statistics to check the multicollinearity. Variable coefficient does not face multicollinearity if VIF is less than two for all the variables (Field, 2005;Hair et al., 2006). The result of VIF is found less than 5 among the variables. According to Durbin's value, the Watson test for both models is 1.859 (WCR) and 1.898 (CCC). This indicates that there is no serial correlation exists. So, there is no need to consider lagged values for dependent variables. While testing the heteroskedasticity in data, White's test was used to reject the null hypothesis of homoscedasticity. This result proved that the data has heteroskedasticity. Regarding the endogeneity problem, Baños-Caballero et al. (2010) argued that working capital management could significantly impact measures of a firm's performance and sales. The null hypothesis of the Durbin-Wu-Hausman test was accepted at the 1 percent level of significance; hence, the two OLS models face an endogeneity problem. Table 3 provides descriptive statistics of all the variables. The WCR average is 14.30 percent, indicating that the sample's companies have diverted 14% of all investments toward the WCM policy. Likewise, these firms take an average of 39 days to complete their CCC. We can also see a huge range in the CCC values, with the minimum being −684.0 and the maximum being 657.57 days. The difference can be explained through the CCC length in these sectors.

Descriptive and correlation statistics
Also, we can see a high standard deviation of 65.03 days. The average operating cash flow is 0.086, meaning as a proportion of total assets operating cash flow is less than 10 percent on average. ROA has an average of about 10 percent and a standard deviation of 0.4379, indicating moderate performance in the sample companies during the period. Tobin's Q ratio has an average of 259.49 percent, saying that the firm value is greater than the total assets of the sample firms. Firm age had an average value of 40.24 years, showing that companies in the sample were founded over an extended period. Firm size varies widely among companies across the study sample, with a mean Firm Size of INR 149,715 and a standard deviation of INR 446,092. In line with firm size, the growth to ranges widely with an average growth rate is 6.7 percent and a minimum of−27.20 percent while the maximum is 1 percent. The ratio is around 0.71, meaning that debt is around 71 percent of total assets, revealing that the firms in the sample are considerably leveraged. Lastly, average GDP growth is about 7 percent, meaning comparatively Indian economy was growing at a brisk pace during the analysis period. Table 4 shows correlations among variables. As evident from the table, independent variables are significantly correlated with at least one of the two proxies. Therefore, both independent variables hold good in the considered model.
Further, Pearson's correlation matrix shows WCR is positively correlated with operating cash flow, cash conversion cycle, Tobin Q, growth, and GDP while negatively correlated with age,   leverage, and size. Whereas CCC is positively correlated with growth, it is negatively correlated with operating cash flow, ROA, Tobin Q, age, leverage, GDP, and size.
The OLS model is applied to variables as per Tables 5-6 We analyzed OLS regression to check the robustness of our model. The regression analysis lays out the predictors OCF (p-value of 0.211 with a t-value of −1.252), ROA (p-value of 0.00 with a t-value of 7.274), TQ (p-value of 0.042 with t-value of −2.037), Age (p-value of 0.00 with t-value of −3.789), size log (p-value of 0.042 with t-value of 2.030), leverage (p-value of 0.167 with t-value of 1.381), growth (p-value of 0.00 with t-value of −4.475), GDP (p-value of 0.00 with t-value of −16.031).
The values mean that apart from OCF and LEV, all the other variables are significant in the model, as the p-value and t-values are in insignificant ranges to determine the profitability (financial performance) of India's manufacturing firms. Table 4 A (ANOVA) shows a linear regression relationship between the dependent (represented by WCR) and independent variables, from the F statistics of 40.869 (highly significant at 0.000) and with a p-value of less than 0.05.  The Durbin Watson (DW) statistic, an autocorrelation residual from regression analysis, is 1.859which is between 0 and 2 -meaning data shows slight positive autocorrelation. A value of 2.0 indicates no autocorrelation and any value from 0 to 2 indicates positive autocorrelation. VIF is computed for each predictor, and it is observed that there is no correlation between the variables.
The OLS model is applied to variables as per Tables 7-8. Regression analysis shows that the predictors OCF (p-value of 0.00 and the corresponding t-value of −8.16), ROA (p-value − 0.363 and t-value -−.909), TQ (p-value − 0.00 and t-value -−8.87), Age (p-value -.6450 and t-value -.461), size log (p-value -.075 and t-value -−1.782), leverage (p-value − 0.00 and t-value − 3.796), growth (p-value − 0.078 and t-value -−1.765), GDP (p-value − 0.00 and t-value -−6.677). Except for ROA, age, Size (log), and growth, all the other variables are significant for the model, as the p-value and t-values are within the range to determine the profitability (financial performance) of the manufacturing companies in India.
When we analyze Table 8 (ANOVA), we see that the F-value of 23.139 is highly significant at 0.000. Thus, we can safely conclude that there is a linear regression relationship between the dependent (represented by WCR) and independent variables as the p-value is less than 0.05. The Durbin-Watson statistic value is 1.898 -which is between 0 and 2 -indicating that there is positive autocorrelation. VIF is computed for each predictor, and it is observed that there is no correlation between the variables.   Table 9 illustrates the empirical model results, in which WCR is used as a proxy variable to analyze working capital management. As already discussed that the OLS model does not address the endogeneity problem; therefore, to overcome that, Blundell and Bond (1998) suggested 2 steps, and a dynamic GMM estimator was tested. The adjusted R2 means that about 85.7% of explanatory variables can be explained through the cross-sectional variation in WCR of the twostep GMM model(column1).
The Durbin-Watson test result is 1.812, which is within the range and indicates an autocorrelation between the dependent and independent variables. By Sargan's statistics, we can say that two-step GMM and dynamic GMM are valid. The Arellano-Bond test was conducted to test whether the model has second-order autocorrelation and the results do not indicate any secondorder autocorrelation problem. Therefore, the conditions for the GMM estimator were satisfied. Table VII does not show any significant positive relation between WCR and OCF with both dynamic and two-step GMM for all models' significance levels; hence, H 1 is partially established.
This negative correlation contrasts the findings of Hill et al. (2010), Abbadi and Abbadi (2013), Al-Talab et al. (2010), and Wasiuzzaman and Arumugam (2013) and postulate that efficient WCM leads to high levels of operating cash flow. Efficient WCM accelerates receivables collection and lengthened liabilities maturities increasing cash flows and lowering WCR.
The two-step and dynamic GMM results indicate a negative relationship between growth opportunities and WCR proving H 2 a. These findings follow the conclusions of previous studies by Narender et al. (2008), Hill et al. (2010), andGill (2011). This is also in consonance with the practices of companies with higher growth opportunities that try to reduce total working capital levels by lowering net operating working capital and liabilities (Chiou et al., 2006). Another important measure of a firm's financial performance is the return on total assets, which at the 1% level of significance in all models proves a significant positive association with WCR. Therefore, H 3 is partially accepted. Previous empirical studies have also shown a firm's performance has a positive impact on WCR levels (Abbadi & Abbadi, 2013;Al-Talab et al., 2010;Chiou et al., 2006;Cuong & Nhung, 2017;Narender et al., 2008;Nazir & Afza, 2009;Rehman et al., 2017;Saarani & Shahadan, 2012;Wiguna & Wasistha, 2017). This result shows that firms with higher profitability would have enough cash available for their investments; hence, their working capital requirements are met with internal finances leading to less attention to WCM.
Tobin's Q, which measures a firm's value, shows a strong positive relationship with WCR, therefore, we reject H4a. Nazir and Afza (2009) and 2017) also show positive relationship between Tobin's Q and WCR. Contrary to the studies of Kieschnick et al. (2013), Hill et al. (2010), Gill (2011), andWasiuzzaman andArumugam (2013), this study shows that companies with high WCR ensure sufficient liquid cash for operations lowering its liabilities and thus galvanizing investors' optimism.
We can conclude that firm age has a very positive relationship with WCR at the 1% significance from both, the two-step GMM and the dynamic GMM; hence, H 5 a is accepted. On similar lines, Chiou et al. (2006) and Saarani and Shahadan (2012) conclude that older companies have higher WCR. Young firms have lower working capital due to their higher growth. Growth rates saturate over time increasing working capital requirements (Chiou et al., 2006). From Table 9, we can see that the mean firm age is about 40.24 years, supporting the findings that firm age has a very positive relationship with WCR.
Firm size and WCR, as shown in the dynamic GMM models' coefficients, have a highly significant negative relationship. Earlier studies by Gill (2011), Wasiuzzaman andArumugam (2013), Abbadi and Abbadi (2013), Cuong and Nhung (2017), and Rehman et al. (2017) all supported these findings. Large companies have better access to capital with high bargaining power compared to smaller firms. This provides an opportunity for large firms to better manage their working capital. Nevertheless, dynamic GMM results are contrary to this. As per Table X10 firm size is positively  Notes: *,**,*** Significant at .1005,0.01 levels correlated with WCR at a 1 percent significance level indicating that smaller firms better manage working capital due to their limited financing avenues to meet their WCR (Hill et al., 2010). These results are in line with the prior literature (Akinlo, 2012;Hill et al., 2010;Salawu & Alao, 2014).
Both the GMM models reveal a significant negative relationship between financial leverage and WCR, thus, H 7 a is accepted. These findings are consistent with many previous studies such as Chiou et al. (2006); Nazir and Afza (2009) (2013); Rehman et al. (2017); among many other studies. This research signaled that due to heavy debt, firms will have a higher interest burden, therefore, be left with limited resources for day-to-day operations and future investments.
GDP and the level of WCR have a significant negative relationship; therefore, H 8 is partially accepted. During the recession, firms have high inventory levels and longer accounts receivable cycles leading to higher WCR contrary to this during boom periods firms have lower WCR. These findings backed up previous research by Chiou et al. (2006), Narender et al. (2008, and Rehman et al. (2009), Ali and Khan (2011). Table 9 reveals all of the explanatory factors that have impacted WCR and thus WCR can be predicted using these variables. Eight sub-hypotheses have been accepted and thus we can conclude that WCR is positively related to firm age, firm performance, firm size, and firm value, whereas WCR, is negatively related to operating cash flow, growth opportunities, leverage, and economic conditions. Table 10 illustrates the empirical model results, in which CCC is used as a proxy variable to analyze working capital management. As already discussed, the OLS model does not address the endogeneity problem; therefore, to overcome that, Blundell and Bond (1998) have suggested a 2 step and dynamic GMM estimator, which was tested. The adjusted R2 demonstrated that the explanatory variables explained 83.2% of the cross-sectional variation in CCC of the two-step GMM model(column1).
The Durbin-Watson test result is 2.354, which is within the range, proving that the data is stationary data and not time series data, therefore, no auto-correlation between the dependent and independent variables. The Sargan statistics result showed that two-step GMM and dynamic GMM are valid. The Arellano-Bond test was conducted to test whether the model has secondorder autocorrelation. The results also indicated no second-order autocorrelation problem with the data, satisfying the conditions of the GMM estimator. Table 10 indicates that the WCR of any year is positively associated with the CCC of the past year; hence it can be interpreted for the sample firms of CCC were already decided.

Conclusion and recommendation
In line with prior literature on the determinants of WCM, this study shows that working capital behavior in Egyptian corporations is affected by factors related to firm characteristics, economic conditions, and industry type. Hence, financial managers have to take the impact of these factors into account when determining investment and financing strategies to guarantee the achievement of efficient WCM. As per the analysis of our empirical results, we can propose the following recommendations for financial managers of listed manufacturing firms on the BSE 500.
• Finance manager should not only focus on the requirement of working capital but also attempt to manage the credit collection period efficiently to maintain a net liquid balance for smooth and efficient business operation.
• Cash conversion cycle becomes more significant in case of depressed GDP, so finance managers must think about alternative sources of financing in case the credit period gets lengthy.
• Our study suggests finance manager to overview the financing pattern as the size of the firm and the age of the firm increases, its financing pattern also changes.
The joint usage of WCR and CCC measurements when exploring the determinants of working capital behavior will help in providing a more comprehensive view, rather than using one of them as a single proxy.
Financial managers should pay more attention to the effective management of both WCR and CCC because this will help them in increasing the levels of current operating cash flows.
In times of economic slack, shrinking CCC length will help firms by providing more liquidity and cash flows necessary to meet their operational needs.
Firms have to take into account the impact of the variations in industry practices when determining the optimal WCR and CCC lengths.

Disclosure statement
No potential conflict of interest was reported by the authors.