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This analysis, based on a variety of standard econometric techniques, aims to be a fairly comprehensive test of the hypotheses about long cycles, associated With the name of Kondratiev/Kondratieff. Our work tries to link the issue of long cycles with the issue of economic convergence and divergence in the World system, because there are very strong cyclical ups and downs of relative convergence in the world system, observable not just in the national growth rates and nati0nal economic cycles. Already the Japanese economist Kaname Akamatsu, Who lived from August 7, 1896 to December 20, 1974, and who was a great admirer of Kondratiev/Kondratieff, hinted at this connection. His most well-known tribute to Kondratiev/Kondratieff (Akamatsu, 1961) speci cally links the rise and decline of the global peripheries to the larger Kondratiev/Kondratieff cycle. His contribution, which is hardly ever mentioned nowadays in the framework of K-cycle research, is the starting point of our analysis. In fact, these Akamatsu cycles , analyzed in this Work, are even stronger and seem to be more devastating than the national Kondratiev/Kondratieff waves and world systemic waves themselves, leading to the discovery of what might be even tenned a double-Tsunami wave structure . Both our re-analysis of world industrial production growth data since 1741 as Well as the global con ict data since 1495, presented in this article, cautiously support the earlier contentions of World system research With evidence, tested by spectral analysis and auto-correlation analysis.
