For futures market participants, because of the short-selling mechanism, there are profit opportunities for high or low indexes. The level of futures index not only reflects the expectation of future commodity demand, but also is easily influenced by irrational trading mood changes caused by various events, such as meteorology, war, social unrest, major emergencies, technological innovation, malicious speculation that may be caused by capital liquidity, etc. Therefore, it is not necessarily a true reflection of the spot market and market expectations. Too high or too low is not conducive to guiding the production, inventory and price formation of bulk commodities and downstream commodities, resulting in destructive abnormal fluctuations in commodity markets and production and life.