This question examines the examinee's understanding of the cyclical factors of economic fluctuations. The cyclical factor of economic fluctuation is one of the important factors that affect the price trend of futures market. The price fluctuation in the futures market is not only related to the domestic economic cycle, but also related to the economic prosperity of all countries in the world. The economic cycle generally consists of four stages, namely, crisis, depression, recovery and upsurge. The changes of commodity prices in various stages of the economic cycle will lead to short-term price rises or falls in the futures market. Therefore, when we analyze the trend of futures prices in a long period, we should pay close attention to the changes in domestic and international economic conditions.