“…The issue of busyness typically attracts regulators, for example, the National Association of Corporate Directors (1996), to recommend the rule-of-thumb limit of three external directorships for each director in the US. As a consequence of the constraints on the supply of the managerial labour, as well as institutional differences, the directorship restrictions in developing countries vary from those of developed countries (Sarkar and Sarkar, 2009; Lei and Deng, 2014; Yatim et al , 2016). However, so far, the studies on board busyness using cross-country data are still limited (Adams et al , 2010).…”