“…Then, the natural and managerial disposability has served a conceptual basis for proceeding research efforts on DEA environmental assessment. See, for example, Goto et al (2014), Sueyoshi and Goto (2012b, 2012d, 2012e, 2012f, 2012g, 2012h, 2012i, 2012j, 2012k, 2013a, 2013c, 2013d, 2014c, 2014d, Sueyoshi and Yuan (2015) and . The disposability concepts are linked to an occurrence of desirable congestions, or eco-technology innovation, by their research efforts.…”