The Court has further acknowledged that the national authorities may have regard to the demands of efficiency and economy and found, for example, that the systematic holding of hearings could be an obstacle to the particular diligence required in social security cases and ultimately prevent compliance with the reasonable time requirement of Article 6 § 1 (see Schuler-Zgraggen v. Switzerland, judgment of 24 June 1993, Series A no. 263, § 58 and the cases cited therein). Although the earlier cases emphasised that a hearing must be held before a court of first and only instance unless there were exceptional circumstances that justified dispensing with one (see, for instance, Håkansson and Sturesson v. Sweden, cited above, p. 20, § 64; Fredin v. Sweden (no. 2), judgment of 23 February 1994, Series A no. 283-A, pp. 10–11, §§ 21–22; and Allan Jacobsson v. Sweden (no. 2) judgment of 19 February 1998, Reports 1998-I, p. 168, § 46), the Court has clarified that the character of the circumstances that may justify dispensing with an oral hearing essentially comes down to the nature of the issues to be decided by the competent national court, not to the frequency of such situations. It does not mean that refusing to hold an oral hearing may be justified only in rare cases (see Miller v. Sweden, no. 55853/00, § 29, 8 February 2005). The overarching principle of fairness embodied in Article 6 is, as always, the key consideration (see, mutatis mutandis, Pélissier and Sassi v. France [GC], no. 25444/94, § 52, ECHR 1999-II; Sejdovic v. Italy [GC], no. 56581/00, § 90, ECHR 2006-…).