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doubletruelibra · 2019年06月01日

问一道题:NO.PZ201601200500000804 第4小题 [ CFA II ]

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老师,这道题的解题思路是,先不考虑option, 现金流按high 和low两种情形的expectation 计算。然后 option的value 单独计算,即以t=1时刻开始的现金流-190, 40,40... (high) 以及 -190,20,20…(low) ,选择行权后折线到t=0 时刻 求出 option 的价值。再把两者相加求出含权NPV

对比基础课的紧挨着的另一道abandon option 例题,为什么不能采取类似的思路,直接求 abandon option 的NPV 呢?就是用行权与否两种情况的现金流(行权-700,0,0) 与 不行权 (0,600,600),两个情形求期望求出 求t=1 时刻的NPV 再折现到t=0 时刻,这样求得的结果等于 这题中的abandon option 的NPV 吗?为什么那道题目中要用含权NPV 减去不含权NPV 得到 option NPV 呢?哇的思路哪里错了呢?盼复,多谢!

问题如下图:

选项:

A.

B.

C.

解释:

1 个答案

maggie_品职助教 · 2019年06月02日

你提问第一段从“然后”之后就不对了:第4小问计算的不是option的价值,而是如果行使这个扩张权利后,新的扩张项目的NPV。扩张项目和放弃项目不同,扩张项目,其实是包括两个项目的,原始项目以及在一时刻的再投入(相当于再投资一次)。而放弃期权相当于我在一时刻如果如果发现需求不高,那我可以果断放弃这个项目,自始至终就只有一个项目。所以对于扩张项目来说最后总的NPV是原项目的NPV加上新项目的NPV。


chevalier913 · 2020年03月14日

是不是说原项目和新项目是相互独立的没有关系的?所以计算新项目的npv并不依赖于原项目是否赚钱?

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NO.PZ201601200500000804 请问行权的时候不就是最优价值了吗?为什么最后还要加上没有option的原始NPV呢?谢谢!

2021-10-23 10:56 1 · 回答

NO.PZ201601200500000804 12.68. 31.03. B is correct. Assume we are time = 1. The NPV of the expansion (time 1) if manis \"high\" is NPV=−190+∑t=19401.10t=C$40.361millionNPV=-190+\sum_{t=1}^9\frac{40}{1.10^t}=C\$40.361millionNPV=−190+∑t=19​1.10t40​=C$40.361million The NPV of the expansion (time 1) if manis \"low\" is NPV=−190+∑t=19201.10t=‐C$74.820millionNPV=-190+\sum_{t=1}^9\frac{20}{1.10^t}=‐C\$74.820millionNPV=−190+∑t=19​1.10t20​=‐C$74.820million The optimcision is to expanif manis \"high\" annot expanif \"low.\" Because the expansion option is exerciseonly when its value is positive, whihappens 50 percent of the time, the expectevalue of the expansion project, time zero, is NPV=11.100.50(40.361)=C$18.346millionNPV=\frac1{1.10}0.50(40.361)=C\$18.346millionNPV=1.101​0.50(40.361)=C$18.346million The totNPV of the initiprojeanthe expansion projeis NPV = –C$5.663 million + C$18.346 million = C$12.683 million The optionexpansion project, haneoptimally, as sufficient value to make this a positive NPV project.请问老师,40/1.1^t t=9,这个计算器怎么按啊?还是要一个一个按,按9个?

2021-07-29 16:45 2 · 回答

NO.PZ201601200500000804 12.68. 31.03. B is correct. Assume we are time = 1. The NPV of the expansion (time 1) if manis \"high\" is NPV=−190+∑t=19401.10t=C$40.361millionNPV=-190+\sum_{t=1}^9\frac{40}{1.10^t}=C\$40.361millionNPV=−190+∑t=19​1.10t40​=C$40.361million The NPV of the expansion (time 1) if manis \"low\" is NPV=−190+∑t=19201.10t=‐C$74.820millionNPV=-190+\sum_{t=1}^9\frac{20}{1.10^t}=‐C\$74.820millionNPV=−190+∑t=19​1.10t20​=‐C$74.820million The optimcision is to expanif manis \"high\" annot expanif \"low.\" Because the expansion option is exerciseonly when its value is positive, whihappens 50 percent of the time, the expectevalue of the expansion project, time zero, is NPV=11.100.50(40.361)=C$18.346millionNPV=\frac1{1.10}0.50(40.361)=C\$18.346millionNPV=1.101​0.50(40.361)=C$18.346million The totNPV of the initiprojeanthe expansion projeis NPV = –C$5.663 million + C$18.346 million = C$12.683 million The optionexpansion project, haneoptimally, as sufficient value to make this a positive NPV project.为何不是在0时刻看,有两种情况 需求低,只投了190,不追加投资,npv为负 追加投资190,需求高,npv为正然后将两种情况各0.5加权求和?现在答案只考虑了第二种情况加权0.5,为何不第一种情况也加权0.5加在一起呢

2021-04-17 16:10 1 · 回答

为什么现金流要乘以0.5呢?即使PROBABILITY是50%,但是这个不是应该假设已经是OPTIMAL了吗,为什么还需要考虑概率。谢谢!

2020-06-04 11:09 1 · 回答

12.68. 31.03. B is correct. Assume we are time = 1. The NPV of the expansion (time 1) if manis \"high\" is NPV=−190+∑t=19401.10t=C$40.361millionNPV=-190+\sum_{t=1}^9\frac{40}{1.10^t}=C\$40.361millionNPV=−190+∑t=19​1.10t40​=C$40.361million The NPV of the expansion (time 1) if manis \"low\" is NPV=−190+∑t=19201.10t=‐C$74.820millionNPV=-190+\sum_{t=1}^9\frac{20}{1.10^t}=‐C\$74.820millionNPV=−190+∑t=19​1.10t20​=‐C$74.820million The optimcision is to expanif manis \"high\" annot expanif \"low.\" Because the expansion option is exerciseonly when its value is positive, whihappens 50 percent of the time, the expectevalue of the expansion project, time zero, is NPV=11.100.50(40.361)=C$18.346millionNPV=\frac1{1.10}0.50(40.361)=C\$18.346millionNPV=1.101​0.50(40.361)=C$18.346million The totNPV of the initiprojeanthe expansion projeis NPV = –C$5.663 million + C$18.346 million = C$12.683 million The optionexpansion project, haneoptimally, as sufficient value to make this a positive NPV project.扩张项目的PVCF1已经得出,为什么折现一期的PV就是NPV?能不能用老师说的画图作差法再一下?

2020-03-30 06:03 1 · 回答