“…The findings in single country SFA (e.g., Gunes & Yildirim, 2016;Stanek, 2015;Rouissi & Bouzgarrou, 2012;Vu & Turnell, 2011;Kalluru & Bhat, 2009) and DEA (e.g., Batir, Volkman, & Gungor, 2017;Hassan & Jreisat, 2016;Kocisova, 2014;Kumar, 2013;Daley, Matthews & Zhang, 2013) studies reveal cost inefficiency. However, while some of these studies (e.g., Batir, Volkman, & Gungor, 2017;Gunes & Yildirim, 2016;Daley, Mathews & Zhang, 2013) present evidence that show improvement in cost efficiency over time, others (e.g., Hassan & Jreisat, 2016;Feng & Serletis, 2009;Kalluru & Bhat, 2009) point to deterioration. Similarly, cross-country SFA (e.g., Rekik & Kalai, 2018;Spulbar & Nitoi, 2014;Perera, Skully, & Wickramanayake, 2007) and DEA (e.g., Belas, Kocisova, & Gavurova, 2019;Banya & Biekpe, 2018;Kacisova, 2014;Casu and Giradone, 2006) studies indicate cost inefficiency and variations among the sample of countries examined.…”