TPurpose This study aims to verify how the product-relevant market for wines should be defined. To do so, the authors apply an empirical methodology to determine the levels of substitution among wine-categories, identifying each relevant market in Argentina. Design/methodology/approach The authors perform an econometric analysis applying the nested logit methodology that will enable us to estimate cross elasticities in wine segments in the Argentine market. The database contains 1,367 brands and a maximum of 395 firms offering products of different segments. If cross elasticities between wine segments are positive and significantly different to zero, the products belong to the same relevant market. In the methodological section, the authors discuss the pros and cons of this approach and its alternatives, while in the empirical analysis, they perform several robustness controls. Findings The proposed method and results provide an alternative to exogenously defining where each product category begins and ends. The results show that the relevant market for wines should be segmented by categories as the substitution between each one is very low. Research limitations/implications In this empirical work, the study analyzes whether each segment constitutes a relevant, independent market. In Argentina, the practice of competition policy does not recognize substitution between different categories of wine; thus, each category constitutes a relevant market by itself, while according to the international practice, the relevant market includes all wine categories. The results suggest exploring the existence of different relevant markets of wine. Practical implications Under the label “wine,” different types or qualities can act as substitutes among them in different possible relevant markets. A more precise definition of relevant markets permits informed decisions facing proposed mergers or anticompetitive practices. Social implications This study provides a mechanism to determine the levels of substitution among wine categories (i.e. to find the boundaries of each relevant market). Wine is a differentiated product and, as such, offers different qualities (categories) for consumers. The consideration of those differences in winery mergers has consequences on social welfare. Originality/value According to the international practice in competition policy, the relevant market includes all wine categories. This study provides an alternative to defining exogenously where each category of product begins and ends and does not assume a priori the direction or intensity of substitution among products.

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