“…Prior studies have examined business groups either at the firm level (e.g., Guillé n, 2000; Khanna & Palepu, 2000b;Kim, Hoskisson, Tihanyi, & Hong, 2004) or at the group level (e.g., Chung & Luo, 2008;Luo & Chung, 2005;Mahmood, Chung, & Mitchell, 2013;Mahmood & Lee, 2004;Mahmood & Mitchell, 2004;Yiu, Bruton, & Lu, 2005) assuming that hierarchy exists at just one level. I argue that group-level diversification should be examined as a separate and different (but related) phenomenon from that of firm-level diversification because the purpose of the former is different from that of the latter.…”