Generally classified according to the length of time, the short time (3-4 years) is also called Kitchen period; The intermediate cycle (9- 10 year) is also called Zhugelan cycle; The long period (50-60 years) is also called the Kondratiev period.

Schumpeter's classification: each long period includes six intermediate periods, and each intermediate period includes three short periods. The short period is about 40 months, the medium period is about 9- 10 years, and the long period is about 48-60 years.

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