We analyse how strategic competition between a green …rm and a brown competitor develops when their products are di¤erentiated along two dimensions: hedonic quality and environmental quality. The former dimension refers to the pure (intrinsic) performance of the good, whereas the latter dimension has a positional content: buying green goods satis…es the consumers' desire to be socially worthy citizens. Product variants thus comply at di¤erent levels with "green" social norms. Consumer preferences depend on a combination of hedonic quality and compliance with social norms. Assuming that the high hedonic quality variant complies less with these norms than the low hedonic quality variant, we characterize di¤erent equilibrium con…gurations which appear as a result of both the intensity of such norms and the willingness to pay for the hedonic quality. Afterwards, we discuss the policy implications of our analysis. Keywords: Hedonic quality, environmental quality, relative preferences.JEL Classi…cation: D62; L13; H13.This working paper is the revised and updated version of the Working Paper DSE N 950. In this new version, we point out the economic e¤ects of strategic competition when products are di¤erentiated along two dimensions that give rise to a hybrid model of product di¤erentiation. We are grateful to