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Spectral analysis has had limited applications in cliometrics to date. In this paper, it is used to determine, through international comparisons, the frequency of GDP series in the long run. A reminder of the spectral methodology (I) is followed by successive examinations of the series chosen, the treatment of these series and the results of the cliometric analysis (II). We show then the macroeconomic perspectives of this type of approach and we synthesise a new major result, i.e. the existence of a single intermediate Kuznets type cycle, in contradiction with the discourse around the dating of the famous cycles of Kondratieff type.JEL classification : B15, B16, B22, B23, B41, C1, C22, C32, C82, E01, E32, N10