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fresh · 2023年10月20日

可以用safety first ratio 大小来选择吗?

* 问题详情,请 查看题干

NO.PZ201805280100000302

问题如下:

A broker proposes to Young three portfolios, shown in Exhibit 1. The broker also provides Young with asset class estimated returns and portfolio standard deviations in Exhibit 2 and Exhibit 3, respectively. The broker notes that there is a $500,000 minimum investment requirement for alternative assets. Finally, because the funds in the money market account are readily investible, the broker suggests using that account only for this initial investment round.


Young wants to earn at least 6.0% after tax per year, without taking on additional incremental risk. Young’s capital gains and overall tax rate is 25%.

Determine which proposed portfolio mostclosely meets Young’s desired objectives. (Circle one.) Justify your response.


解释:



如题,对incremental risk还是不大理解,可以用safety first ratio 来判断吗? 对应选择是是portfolio 1,谢谢老师!

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lynn_品职助教 · 2023年10月21日

嗨,从没放弃的小努力你好:


如题,对incremental risk还是不大理解,可以用safety first ratio 来判断吗? 对应选择是是portfolio 1,谢谢老师!



同学有这个考虑很正常,是会联想到SFR,这道题我们用SFR并不合适。


平时我们一般关注risk-adjusted return,风险调整后的收益,将风险和收益一同考虑,如夏普比率、SFR,可以认为是考虑收益的性价比。如果本题写着base on risk-adjusted expected return,就应该用SFR。


但是这道题有点不太一样,它说希望满足最低6%的收益率,然后without taking on additional incremental risk,即既要考虑收益,也不希望产生增量风险。这里其实是将收益和风险单独考虑,在满足收益要求的情况下,风险要足够低,所以是两条独立标准。


因此第一步就是计算各自组合的收益,发现它们三个都满足要求,但是组合1的风险远要大于组合3,所以这道题选组合3而不是组合1。

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虽然现在很辛苦,但努力过的感觉真的很好,加油!

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