What is the reasoning behind the supremacy principle as per the Costa case?

Knowing the judgement of landmark cases like Costa and being able to elaborate on the arguments presented by the Court will definitely win you extra points on the exam.
For example, in Costa, the CJEU argued that Article 288 of the TFEU establishes the principle of EU regulations being binding and directly applicable in all member states. They state that this provision would be meaningless if states could cancel the EU regulations simply by enacting a new law overruling it. Therefore, the new legal order created by the EU cannot exist without EU law being supreme over the national laws of the Member States.
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