When two counter-parties trade SIF futures,the buyer is betting that the index up to a specified point in time will be above a certain level. The seller,on the contrary,holds the opposite view.

• 当两方买卖指数期货，买方是根据其研究、信息等，判断特定时候的指数会超过特定水平，卖方则认为同个时候的指数会低过该水平。