24Next, it is true that the ESCB must be allowed a broad discretion since, when it prepares and implements an open market operations programme, it is required to make choices of a technical nature and to undertake complex forecasts and assessments. The fact remains, however, that the Court is required to ascertain, in its review of the proportionality of the measures entailed by such a programme in relation to monetary policy objectives, whether the ESCB made a manifest error of assessment in that regard (see, to that effect, judgment of 16 June 2015, Gauweiler and Others, C‑62/14, EU:C:2015:400, paragraphs 68, 74, 81 and 91).
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