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Addressing a ‘self-trade’ issue in GTAPAgg

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  • Hamdi-Cherif, Meriem
  • Ghersi, Frédéric

Abstract

The successive versions of the GTAP databases are provided with GTAPAgg, a programme that computes values of the series of the database for any regional and sectoral aggregation. A ‘self-trade’ issue arises from the fact that GTAPAgg aggregates the several series concerned with international trade, like any other series, by simply summing them up: the resulting series include a share of exports and imports happening between the aggregated regions, which should rather be treated as economic flows internal to the region resulting from the aggregation process. This paper details a method that aims at solving this shortcoming, and discusses the importance of doing so. A first section puts the research question into context and discusses its likely importance when using GTAP as a calibration dataset for computable general equilibrium modelling. A second section details the analytics of the method proposed to correct the aggregation process, in the broader framework of a programme extending GTAPAgg to the production of national account matrixes in the standard United Nations format. An appendix provides the code of the extended aggregation programme developed.

Suggested Citation

  • Hamdi-Cherif, Meriem & Ghersi, Frédéric, 2011. "Addressing a ‘self-trade’ issue in GTAPAgg," Conference papers 332105, Purdue University, Center for Global Trade Analysis, Global Trade Analysis Project.
    • Handle: RePEc:ags:pugtwp:332105
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    File URL: https://ageconsearch.umn.edu/record/332105/files/5357.pdf
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    References listed on IDEAS

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