“…Based on the two tenets of COR theory, we suggest that OCB has an inverted U-shaped relationship with citizenship fatigue. According to the resource conservation tenet ( Hobfoll, 1989 , 2001 ; Hobfoll et al, 2018 ), when people lose resources at work, they are more likely to experience job burnout and negative physical or psychological impacts ( Halbesleben et al, 2014 ; Baranik et al, 2019 ; Maffoni et al, 2020 ; Merino et al, 2021 ). Therefore, we argue that when the level of OCB increases from low to moderate, individuals are confronted with the increasing loss of critical resources (e.g., time, cognitive resources, and emotional resources) ( Bergeron, 2007 ), they lack the energy to maintain their normal functioning at OCB, eventually leading to the increase in citizenship fatigue ( Bolino et al, 2015 ; Qiu et al, 2020 ).…”