This question examines candidates' 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 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 rise or fall of futures market prices. Therefore, we should pay close attention to the changes of domestic and international economic conditions when analyzing the trend of futures prices for a long period of time.