Still Hazy after All These Years: The Interpretation of National Treatment in the GATT/WTO Case-law on Tax Discrimination Henrik Horn * and Petros C.Mavroidis** Full text available: PDF format ** Abstract This article discusses the National Treatment (NT) obligation as applied in the GATT tax discrimination cases. The central thesis of the paper is that case-law has not clarified the interpretation of the terms in Article III. It appears that the reason for this failure is the lack of a conceptually coherent view of the role of the NT obligation. After summarizing the case-law on discriminatory taxation, this article lays out a theory of the role of NT in trade agreements, in order to shed light on appropriate interpretations of the terms appearing in Article III. We start from the notion that the GATT is an obligationally incomplete contract. This incompleteness invites beggar-thy-neighbour type behaviour, and the NT obligation is an imperfect remedy for such problems. We suggest that likeness/directly competitive or substitutable (DCS) should be determined 'in the market place', whereas the 'so as to afford protection' criterion is ultimately about the protection of expectations concerning the intent behind domestic regulations. But since intent usually cannot be determined directly, adjudicating bodies have to seek recourse to indirect evidence, as is frequently done in legal practice. * Institute for International Economic Studies, Stockholm University, and CEPR, London ** University of Neuchâtel and Columbia Law School, New York, and CEPR, London
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