40Indeed, while European Union primary law can offer no guarantee to an insured person that moving to another Member State will be neutral in terms of social security, in particular where sickness and old-age pension insurance are concerned, since, given the disparities between the Member States’ social security schemes and legislation, such a move may be to the advantage of the person concerned in terms of social security, or not, depending on the circumstances, it is settled case-law that, where its application is less favourable, national legislation is consistent with EU law only to the extent that, in particular, such legislation does not place the worker at a disadvantage compared with those who pursue all their activities in the Member State where it applies and does not purely and simply result in the payment of social security contributions on which there is no return (see judgment in Mulders, C‑548/11, EU:C:2013:249, paragraph 45 and the case-law cited).
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