“…According to S-C-P hypothesis, higher profitability in any market is associated with anticompetitive behaviour induced by higher market concentration' (Njegomir & Stojic, 2010a). The support for the S-C-P hypothesis is abundant (e.g., Bajtelsmit & Bouzouita, 1998;Chidambaran, Pugel, & Saunders, 1997;Njegomir & Stojic, 2011;. To capture the impact of the competitiveness of firms' markets on performance, we first calculate a Herfindahl-Hirschman concentration index for each line of business (j = 1 to I L ) across all firms (i = 1 to n) in each year t…”