题目内容

甲乙两人各在纸片上写上“上”或“下”，然后双方同时翻开纸片，如果两人的字相同，那么甲赢2块钱，乙输两块钱；如果写的字不同，那么乙赢1块钱，甲输1块钱。下列关于该博弈纳什均衡的描述哪一项是正确的( )(上海财经大学2009研)

A. 甲以1／2概率选择“上”；乙以1／2概率选择“上”
B. 甲以1／3概率选择“上”；乙以1／3概率选择“上”
C. 甲以1／3概率选择“上”；乙以1／2概率选择“上”
D. 甲以1／2概率选择“上”；乙以1／3概率选择“上”

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Portfolio managers at Goodwin & Associates believe they can significantly alter the risk/return profile of their risky portfolios by allocating a portion of available funds to the risk-free asset. Which of the following statements correctly assesses the effect of combining the risk-free asset with a risky portfolio Adding the risk-free asset will:

A. decrease portfolio standard deviation due to its positive correlation with risky assets.
B. decrease portfolio standard deviation because it is uncorrelated with risky assets.
C. decrease portfolio standard deviation due to its negative correlation with risky assets.

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