122Finally, as regards Albany's argument that an adequate level of pension for workers could be assured by laying down minimum requirements to be met by pensions offered by insurance companies, it must be emphasised that, in view of the social function of supplementary pension schemes and the margin of appreciation enjoyed, according to settled case-law, by the Member States in organising their social security systems (Case 238/82 Duphar and Others [1984] ECR 523, paragraph 16; Poucet and Pistre, cited above, paragraph 6; and Case C-70/95 Sodemare and Others [1997] ECR I-3395, paragraph 27), it is incumbent on each Member State to consider whether, in view of the particular features of its national pension system, laying down minimum requirements would still enable it to ensure the level of pension which it seeks to guarantee in a sector by compulsory affiliation to a pension fund.
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