How important is intra-industry trade in trade growth?
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Empirical work on intra-industry trade (IIT) is almost 30 years old. Initial research sought to identify if IIT was a significant share of total trade (TT). The Grubel-Lloyd (GL) index was widely used for this purpose. Interest has since shifted to the changing importance of IITover time. Using movements in the GL index to infer the importance of IIT over time is not only vague, but can be misleading. In this article, we measure the contributions of growth in net trade (NT) and IIT to the growth in TT. To understand changes in IIT over time, we also derive the contributions of imports and exports to the growth in TT, NT, and IIT. All our formulas are illustrated with data for 205 Australian manufacturing industries.
Key wordsintra-industry trade decomposing trade growth adjustment costs
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