51In its case-law, the Court has also set out criteria for the interpretation of those concepts, which specifically take account of the specific objective of Directive 93/13, that is to say, to require Member States to provide for a mechanism ensuring that every contractual term not individually negotiated may be reviewed in order to determine whether it is unfair for the purposes the protection granted to a consumer on account of the fact that he is in a position of weakness vis-à-vis the seller or supplier, as regards both his bargaining power and his level of knowledge (see, to that effect, judgment in Kásler and Káslerné Rábai, EU:C:2014:282, paragraphs 39 and 40).
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