Chapter 13 Disaggregation of Input-Output Tables

In this chapter we document the disaggregation of the input-output (I-O) tables. This is the major step undertaken in our in-house processing of the tables (for an overview of the processing, see chapter 11.A). It takes place after some initial clean-ups and adjustments, and before the synthesis of the composite region tables (chapter 14), further minor adjustments, and the fitting of the I-O tables to external data (chapter 19). While we use a 57-sector classification for the GTAP 6 Data Base, many countries ’ input-output source statistics do not support such detail. In particular, few I-O sources match the relatively ambitious requirements for agriculture and food processing, where GTAP distinguishes 20 sectors, while some sources distinguish as few as two (agriculture and food processing separately). Accordingly, we accept contributed I-O tables using any reasonable aggregation of this classification, (Huff, McDougall and Walmsley, 2000). Where the contributed table uses an aggregated classification, we must disaggregate it to the standard 57 sectors in-house. Altogether, in GTAP 6, 17 regions require sectoral disaggregation. Of these five require disaggregation only in non-agricultural sectors, while four require disaggregation in agriculture. For non-agricultural sectors we use a disaggregation procedure that is relatively undemanding in data