The use of global input-output tables, and the creation of Trade in Value-Added (TiVA) statistics, has greatly improved our understanding of the fragmentation of global production through value chains.However, their application requires a number of assumptions that, in practice, typically understate the degree of interconnectedness.TiVA estimates implicitly assume identical production functions across firms within an industry, when in reality production functions differ considerably.Typically, larger (and foreign-owned) firms tend to be more trade oriented than smaller (and domestically-owned) firms.As a result, TiVA statistics underestimate the import content of exports for the economy as a whole, a key indicator characterizing global production.Moreover, TiVA analyses are based on basic price concepts, which provide an appropriate view of production through value chains, but are less well equipped to analyse consumption, particularly as they exclude significant distribution margins (in particular retail and wholesale activities, often including marketing activities and brands), which add value at the end of the chain.This can distort analyses using "smile curves", which show the distance from final demand of different sectors within value chains, and in turn understate the scale of jobs supported by trade. Trade in Value-Added (TiVA) statistics have greatly improved our understanding of GVCs, but they use assumptions that generate typically downward biases in measures of GVC integration, and they give little information regarding the investment strand of GVCs. Efforts to mainstream key characteristics of different types of firms in the production of tomorrow's TiVA models, through extended supply-use tables, should be prioritized, to improve not only their relevance, but also their quality. Efforts to complement TiVA estimates currently based on basic prices with estimates based on market prices should also be initiated, not only to ease interpretability, but also to highlight the significant role played by distributors and to better understand the role played by intellectual property.Market-based approaches, for example, reveal that 9 million jobs are sustained in the United States through sales of imports.
Ahmad Nadim (Tue,) studied this question.