“…At this stage, we mainly focus on value-added, employment, environmental impacts generated by Downloaded by [University of Cambridge] at 11:33 12 August 2014 international trade and the slicing up of global value chains (for example, Chen et al, 2001Chen et al, , 2012Koopman et al, 2012;Timmer et al, 2013). Two kinds of IOTs have been discussed a lot: intercountry and single country IOTs.…”