Example of this is a situation where Mexico import raw steel from Japan , and stamp and pressed them to be exported to United States where the steels are used for manufacturing tractors and other farm implements . According to Hummels et al (1999 , the vertical specialization involved in the trade of semi-finished goods among nations has the key feature of which is that imported inputs are used to produce a country 's export goods . ``Our concept emphasizes the twin notions that...











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