“…Enterprise input-output models have been constructed previously, but mostly as singleregion models for one enterprise only (for example, Farag, 1967;Lin and Polenske, 1998;Correa and Craft, 1999;Albino and Kühtz, 2004;Lave, 2006), or as extended single-region models of an economy with an enterprise represented by one additional sector (Tiebout, 1967;Billings and Katz, 1982;Lenzen, 2008), but rarely as nested multi-region models, as done by Polenske (1997) and Li et al (2008). Polenske's basic idea was taken up again in recent input -output-based hybrid life-cycle approaches, where a so-called foreground system containing interdependent production processes, is embedded in a national input -output table (Heijungs and Suh, 2002;Suh, 2004).…”