61A Member State cannot rely on the existence of an advantage granted unilaterally by another Member State, in this case the Member State in which Mr Imfeld works and earns all his income, to escape its obligations under the Treaty, in particular under the Treaty provisions on freedom of establishment (see, to that effect, Case C-379/05 Amurta [2007] ECR I-9569, paragraph 78; Case C-11/07 Eckelkamp and Others [2008] ECR I-6845, paragraph 69; and Case C-43/07 Arens-Sikken [2008] ECR I-6887, paragraph 66).
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