Working capital management, board structure and Tobin's q ratio of Thai listed firms

Purpose This study investigates whether the integration between working capital management (WCM) and the structure of a firm's board of directors impacts its Tobin's q ratio. The sample set consists of 319 Thai listed firms with 3,190 firm-year observations from 2010 to 2019. Design/methodology/approach The two-step generalized method of moments (two-step GMM) model is employed to address endogeneity. Findings The empirical results show that having both (1) a high level of net working capital holdings, a long period of net trade cycles or using an aggressive policy in working capital investment and (2) a more diverse board of directors decrease a firm's Tobin's q ratio. Conversely, when a firm's managers employ an aggressive policy for their working capital financing and the board structure of their firms is highly diverse, the firm's Tobin's q ratio increases. This indicates the appropriateness of some WCM policies is dependent on the characteristics of a firm's board of directors. Thus, the different integration between WCM and board structure may elicit dissimilar outcomes for a firm's Tobin's q ratio. Originality/value To their knowledge, the authors are the first to investigate the influence of the integration between WCM and board characteristics on Tobin's q ratio.