“经济周期(Business cycle):也称商业周期、景气循环,它是指经济运行中周期性出现的经济扩张与紧缩交替更迭、循环往复的一种现象,是国民总产出、总收入和总就业的波动,是总体经济活动的周期性变化。”以上是教科书对经济周期的定义。 Business cycle, also known as the business cycle, business cycle, it refers to the economic operation of cyclical economic expansion and contraction alternately alternating cycle of reciprocation is a phenomenon of national output, total revenue and The volatility of total employment is a cyclical shift in the overall economic activity. “” This is the textbook’s definition of an economic cycle.