TY - RPRT EP - 16 ID - eprints2325 M1 - imt_eic_working_paper N2 - The fragmentation of production across countries has become an important feature of the globalization in recent decades and is often conceptualized by the term, global value chains (GVCs). When empirically investigating the GVCs, previous studies are mainly interested in knowing how global the GVCs are rather than how the GVCs look like. From a complex networks perspective, we use the World Input-Output Database (WIOD) to study the global production system. We find that the industry-level GVCs are indeed not chain-like but are better characterized by the tree topology. Hence, we compute the global value trees (GVTs) for all the industries available in the WIOD. Moreover, we compute an industry importance measure based on the GVTs and compare it with other network centrality measures. Finally, we discuss some future applications of the GVTs. A1 - Zhu, Zhen A1 - Puliga, Michelangelo A1 - Cerina, Federica A1 - Chessa, Alessandro A1 - Riccaboni, Massimo PB - IMT Institute for Advanced Studies Lucca SN - 2279-6894 UR - http://eprints.imtlucca.it/2325/ TI - Global value trees AV - public KW - Keywords: Complex Networks; Tree; Input-Output; Value-Added; Globalization - JEL Codes: C67 KW - F10 KW - F15 - PACS numbers: 89.65.Gh; 89.75.-k; 05.10.-a Y1 - 2014/10// ER -