26At the outset, it must first be recalled that, according to established case-law, the system of protection established 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 bargaining power and his level of knowledge, which 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, judgment in Kušionová, C‑34/13, EU:C:2014:2189, paragraph 48 and the case-law cited).
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