“…To overcome such limitations, this study employs two models where model 1 is based on 'flow' concept, in which all variables are measured as amounts per a unit of time (during a year), and model 2 is based on the 'stock' concept, in which all variables are measured as amounts at a particular point in time (at the end of the financial year). The model 1 draws upon Drake, Hall, and Simper (2009), Hadad et al (2008), and Sathye (2003) and aligns with revenue/profit based efficiency initially proposed by Berger and Mester (1997). In © 2011 The Clute Institute contrast, model 2 draws upon Kirkwood and Nahm (2006 model A), Sathye (2001), and Sturm and Williams (2004) and relies on traditional cost efficiency concept.…”