3個月後標準普爾期貨價格=1000e(10%-5%)3/12=1012.578.
三個月後指數現貨點1100,那麽1100-1000=100;
期貨差,1012.578-950=62.578;
套利,買現貨賣期貨。總盈利=100-62.578=37.422