23In that regard, according to the settled case-law of the Court, the system of protection implemented by Directive 93/13 is based on the idea that the consumer is in a weak position vis-à-vis the seller or supplier, as regards both his or her bargaining power and his or her level of knowledge. This leads to the consumer agreeing to terms drawn up in advance by the seller or supplier without being able to influence the content of those terms (see, inter alia, judgments of 4 June 2009, Pannon GSM, C‑243/08, EU:C:2009:350, paragraph 22, and of 17 May 2018, Karel de Grote — Hogeschool Katholieke Hogeschool Antwerpen, C‑147/16, EU:C:2018:320, paragraph 26).
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