“…inter-industry, horizontal, and vertical intra-industry trade) remains imperfectly explained. While there is a broad, theoretically and empirically supported consensus for long decades that relative factor endowment differences enhance or are the very reason of inter-industry trade (except for the case of possible factor intensity reversals) and also that the stronger prevalence of horizontal intra-industry flows can be expected between countries with more similar relative endowments, there is not an unquestionable monotonic relationship between the share of vertical intra-industry trade and factor endowments (see Gabszewicz et al, 1981, Shaked and Sutton 1984, Motta 1992, 1994, Lutz and Turrini, 1999, Gabszewicz and Turrini, 1997, Haucap et al 2000, and Cabral et al 2013 for at least some slightly different approaches compared to the former 'consensus' on the existence of that). As far as the latest developments are concerned, while traditional trade theory adopted a country as its basic unit of analysis, new trade theory focused on industries.…”