*This article is an automatic translation of the original article, provided here for your convenience. Read the original article. I. In some cases, goods that are not demand-substitutable must be aggregated in the relevant market 1. The definition of the relevant market is the first, and probably the most critical, step in the process of analysing a competition case. As Baker notes, "in the history of US competition litigation, the outcome of a case has been based on relevant market considerations more than on any other substantive issue [1]. Even if the importance of the relevant market is nowadays debated, in particular with the appearance of the UPP tests in the merger guidelines, the assessment of an anti-competitive complaint or the analysis of a proposed merger always starts
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LAW AND ECONOMY : NON-SUBSTITUTABLE PRODUCTS - AUTOMOTIVE - TRADITIONNAL APPROACH - RELEVANT MARKET DEFINITION - TRANSACTIONAL COMPLEMENTARITY NOTION
Delimitation principles of the "bundled market" boundary
Whenever firms producing a large range of non substitutable products (e.g. automotive parts) are involved in an antitrust case, it is difficult to use the traditionnal approach to relevant market definition, based upon demand side substitutability. Absent clear jurisprudential guidances, in such situations, economic analysis recommands using the notion of "transactional complementarity", which can be made operational using the Spearman statistical test.
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