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ditto · 2023年10月22日

project 和 return rate 的函数近似关系怎么画出来的

NO.PZ2022090804000014

问题如下:

Consider the two investments below. The cash flows, as well as the NPV and IRR, for the two investments are given. For both investments, the required rate of return is 10%.


What discount rate would result in the same NPV for both investments?

选项:

A.A rate between 0.00% and 10.00% B.A rate between 10.00% and 15.02% C.A rate between 15.02% and 16.37%

解释:

Solution

B is correct. For these investments, a discount rate of 13.16% would yield the same NPV for both (an NPV of 6.73).

参考老师在其他问题下面的回答里面画了两个Projects和return rate的关系:https://class.pzacademy.com/qa/111602

请问1. 如何确定两个Project的斜率, 2.没看懂两个Irr相同, 也就是横坐标相同时候,函数曲线是怎么转换的

1 个答案
已采纳答案

王琛_品职助教 · 2023年10月23日

嗨,爱思考的PZer你好:


1)如何确定两个Project的斜率

相比于斜率,其实更重要的问题可能是:横纵坐标轴截距的含义是什么

纵轴是 NPV,所以纵轴的截距,代表当项目的折现率为 0 时,项目的 NPV 是多少

项目 1,直接加总各期现金流,得到 NPV 等于 44

项目 2,直接加总各期现金流,得到 NPV 等于 75

由此可以确认,纵轴截距方面,项目 2 的截距更大,或者说位置更高

横轴是折现率,所以横轴的截距,代表当项目的 NPV 为 0 时,折现率为多少

这正是 IRR 的定义

所以横轴截距就是 IRR

根据表格数据,项目 1 的 IRR 更大,或者说位置更靠右

由此,我们可以画出两个项目的图形

斜率反而不那么重要了,也不是我们关注的重点哈

2)没看懂两个Irr相同, 也就是横坐标相同时候,函数曲线是怎么转换的

首先,横坐标只是折现率,并不代表 IRR

IRR 只是横轴的截距,是一个特殊的点

而两个项目的横坐标相同时,NPV 也相同的点,其实是 crossover rate

即,当两个项目,按着这一相同的折现率折现时,得到的 NPV 是相同的

其他情况下,NPV 都不同

如果折现率小于 crossover rate,那么代入相同的折现率,项目 2 的 NPV 更大,或者说位置更高

如果折现率大于 crossover rate,那么代入相同的折现率,项目 1 的 NPV 更大,或者说位置更高

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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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