回报率的非期望部分由下一个月内显示地信息导 致,例如 News about Flyers research Government figures released on the gross national product (GNP) Results of the latest arms-control talks Discovery that a rival s product has been tampered with News that Fleyers'sales figures are higher than expected A sudden drop in interest rates The unexpected retirement of flyers founder and president• 回报率的非期望部分由下一个月内显示地信息导 致，例如 – News about Flyers’research – Government figures released on the gross national product (GNP) – Results of the latest arms-control talks – Discovery that a rival’s product has been tampered with – News that Fleyers’sales figures are higher than expected – A sudden drop in interest rates – The unexpected retirement of Flyers’founder and president