Discussion
Scholars have called for extensive integration of leadership theories and constructs such as LMX and LID (e.g. Dinh et al., 2014; Meuser et al., 2016). This study answers this call and found that LMX and LID are very likely conduits of different motivational qualities for channeling leadership effects on helping and taking charge. Findings also revealed that the three conceptually diverse leadership styles influenced LMX and LID in distinct and previously undiscovered ways.
Theoretical implications
Our central contribution demonstrates that two conceptually distinct aspects of leader-follower role relationship work concurrently to explain how and why leaders affect two distinct OCBs. Some scholars emphasize the kinship between LMX and LID by suggesting that high LMX necessarily relates to high LID (Lavelle et al., 2007). Others argue that the important theoretical differences between LMX and LID should be adequately recognized and researched (Uhl-Bien, 2006; van Knippenberg et al., 2004). We integrate these views into a nuanced account of the mediating roles of LMX and LID. Regarding the two-stage leadership indirect effects, although LMX explained how leadership affected helping, it was unable to illuminate how leaders fostered taking charge.