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所谓“经济周期”的概念，一般是指描述经济运行的主要指标随时间推移而出现的规律性变化。本二世纪初，美国的部分经济学家和统计学家在研究美国经济增长的历史数据时发现了某些经济指标的周期性变化规律，并对其进行了较深入的研究。主要是试图找出经济指标发生周期变化的内?
The so-called concept of “economic cycle” generally refers to the regular change in the main indicators describing the economic operation as time goes by. At the beginning of the second century, some economists and statisticians in the United States found periodic changes in certain economic indicators while studying the historical data of the U.S. economic growth and conducted a more in-depth study on them. Mainly trying to find out the cycle of economic indicators within?