这种做法是为了减少因现货价格升高而带来的风险。举例来说:一个出口商答应四个月后将900吨的豆油运到外地顾客处,而价格在签合同时已经敲定。因为豆油要在四个月以后运输,出口商无法确定那时的价格在何种水平。当然,出口商可以马上买进所需的豆汕,并将它储存起来,然后在到期时将豆油运出去。可是这样做需要付仓租费、保险费和四个月的利息,而且 This approach is to reduce the risk of rising spot prices. For example: An exporter promised to transport 900 tons of soybean oil to foreign customers four months later, and the price was finalized at the time of signing the contract. Since soy oil is to be transported after four months, exporters cannot determine the price at that time. Of course, the exporter can immediately buy the required soybean meal, store it, and then deliver the soybean oil when it expires. However, this will require payment of warehouse rental fees, insurance premiums and four-month interest, and