37That principle that the legislation of a single Member State applies in matters of social security is aimed at avoiding the complications which may ensue from the simultaneous application of a number of national legislative systems and at eliminating the unequal treatment which, for persons moving within the European Union, would be the consequence of a partial or total overlapping of the applicable legislation (see, to that effect, judgments in Commission v France, EU:C:2000:84, paragraph 46; Commission v France, EU:C:2000:85, paragraph 43; and Allard, C‑249/04, EU:C:2005:329, paragraph 28).
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