【評論主題】26.有一位投資人的效用函數為：U ( R,σ ) =5R−2σ ，其中R為投資預期報酬率，σ為投資的風險。則如何描述 這位投資人？ (A)風險中立者(

【評論內容】風險中立者，A = 0，完全不受風險的影★，...

【評論主題】【題組】137. (A) The questions are the same as those used five years ago.(B) Patrons of the library are

【評論內容】格子137前 句子最後提到five-ye☆☆ ...