The term economic cycle here relates to deviations from the long-term track of the growth (Economic growth) of a national economy. Fluctuations in economic activity, measured by the gross economic product of goods, may be seasonal in nature or extend for a period of years. Long-term variations are the so-called Kuznets-cycles, lasting approximately 25 years, observed in particular in connection with migration (Occupational migration; Emigration; Mobility) and development investments in the USA…