22According to settled case-law, all trading rules enacted by Member States which are capable of hindering, directly or indirectly, actually or potentially, trade within the European Union are to be considered as measures having an effect equivalent to quantitative restrictions and are, on that basis, prohibited by Article 34 TFEU (see, inter alia, Case 8/74 Dassonville [1974] ECR 837, paragraph 5, and Case C-108/09 Ker-Optika [2010] ECR I-12213, paragraph 47). Thus, the mere fact that an importer might be dissuaded from introducing or marketing the products in question in the Member State concerned constitutes a restriction on the free movement of goods for the importer (Case C-171/11 Fra.bo [2012] ECR, paragraph 22 and the case-law cited).
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