51With regard to the examination as to whether there may be a significant imbalance, this cannot be limited to a quantitative economic evaluation based on a comparison between the total value of the transaction which is the subject of the contract, on the one hand, and the costs charged to the consumer under that clause, on the other. A significant imbalance may result solely from a sufficiently serious impairment of the legal situation in which the consumer, as a party to the contract in question, is placed by reason of the relevant national provisions, whether this be in the form of a restriction of the rights which, in accordance with those provisions, he enjoys under the contract, or a constraint on the exercise of those rights, or the imposition on him of an additional obligation not envisaged by the national rules (judgment of 16 January 2014, Constructora Principado, C‑226/12, EU:C:2014:10, paragraphs 22 and 23).
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