“…Starting with Leontieff and his team at Harvard University, Akhabbar, Antille, Fontela and Pulido (2011) explain how input-output models fared in United States and how the tool of analysis moved to Europe. These models have been used to analyze various topics, among which are quantification of carbon emission effects of production on the environment (Minx, Wiedmann, Wood, Peters, Lenzen, Owen, Scott, Barret, Hubacek, Baiocchi, Paul, Dawkins, Briggs, Guan, Suh and Ackerman, 2009), examination of sectorial energy usage (Lin and Polenske, 1995), identification of key sectors that need to be supported in times of crisis (Luo, 2013), and analysis of interactions between the real and financial sectors (Leung and Secrieru, 2012). Though frequently denoted in terms of value units, input-output tables in quantity units can also be constructed.…”