According to the Russian economist N. Kondratieff, long wave crisis in capitalist countries appears every 40 to 60 years.

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Nikolai Kondratieff, a Russian economist, proposed the theory of long waves or Kondratieff waves, suggesting that capitalist economies experience long-term cycles of boom and bust, approximately every 40 to 60 years, due to technological innovations and other factors.

According to the Russian Economist N