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hjk · 2024年05月04日

你好老师这题的r2为什么是这样算,他不是卖了两只股票吗

NO.PZ2023101902000043

问题如下:

You make an investment over two periods, from today (T0) to the end of the first year (T1), and then to the end of the second year (T2). Today (T0), you buy one share at a cost of $10.00. The stock pays a $2.00 annual dividend. At the end of the first year (T1), your single share pays a $2.00 dividend; and, as the price increased by only $1.00, you buy a second share at a cost of $11.00. By the end of the second year (T2), the stock price has soared to $18.00. You then decide to collect both dividends ($2.00 for each share) and sell both shares, for total proceeds at the end of the second year (T2) of $40.00. What are, respectively, the time-weighted (aka, geometric) and dollar-weighted (aka, internal) rates of return?

选项:

A.36.5% (time) and 45.8% (dollar) B.49.7% (time) and 56.3% (dollar) C.53.7% (time) and 60.0% (dollar) D.60.2% (time) and 71.2% (dollar)

解释:

7% (TWR) and 60.0% (dollar-weighted). Time-weighted (geometric) return: R(1) = (11+2-10)/10 = 30%; R(2) = (18+2-11)/11 = 81.818%; R(G) = (1.3 ×1.81818%) (1/2) - 1 = 53.74% Dollar-weighted return: 10 + 11/(1+r) = 2/(1+r) + 40/(1+r)2; 10(1+r)2 + 9(1+r) - 40 = 0; let a = (1+r): 10a2 + 9a - 40 = 0; (5a - 8)(2a + 5) = 0, such that 5a = 8, a = 1.6 and r = 60%.

You make an investment over two periods, from today (T0) to the end of the first year (T1), and then to the end of the second year (T2). Today (T0), you buy one share at a cost of $10.00. The stock pays a $2.00 annual dividend. At the end of the first year (T1), your single share pays a $2.00 dividend; and, as the price increased by only $1.00, you buy a second share at a cost of $11.00. By the end of the second year (T2), the stock price has soared to $18.00. You then decide to collect both dividends ($2.00 for each share) and sell both shares, for total proceeds at the end of the second year (T2) of $40.00. What are, respectively, the time-weighted (aka, geometric) and dollar-weighted (aka, internal) rates of return?


7% (TWR) and 60.0% (dollar-weighted). Time-weighted (geometric) return: R(1) = (11+2-10)/10 = 30%; R(2) = (18+2-11)/11 = 81.818%; R(G) = (1.3 ×1.81818%) (1/2) - 1 = 53.74% Dollar-weighted return: 10 + 11/(1+r) = 2/(1+r) + 40/(1+r)2; 10(1+r)2 + 9(1+r) - 40 = 0; let a = (1+r): 10a2 + 9a - 40 = 0; (5a - 8)(2a + 5) = 0, such that 5a = 8, a = 1.6 and r = 60%.

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李坏_品职助教 · 2024年05月04日

嗨,爱思考的PZer你好:


这个人是先在T0时刻买入第一只股票,成本价10块钱,在T1时刻股价升为11块钱,并且有2块钱分红。所以T0到T1的收益率R1 =  (11+2-10)/10 = 30%.


R2的意思是T1时刻到T2时刻的收益率。在T1时刻这个人买入第二只股票,成本价是11块钱,在T2时刻升为18块钱,并且有2块钱分红。如果按照两只股票来计算,那么T1时刻到T2时刻的收益率R2 = (18*2 + 2*2 -11*2) / (11*2) = 81.818%, 这个结果和一只股票的计算结果是一样的。

注意R2表示单独看T1到T2的收益率,所以第一只股票的成本价也应该按照T1时刻的价格11块钱来算。

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就算太阳没有迎着我们而来,我们正在朝着它而去,加油!

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2024-10-19 14:12 1 · 回答

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2024-08-08 20:39 1 · 回答