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Susie · 2023年03月15日

这题的3200哪来的？

  1. CFA I
  2. Economics Analysis

NO.PZ2022071403000039

问题如下：

Question

A power generation company is a monopoly that has very high barriers to entry. The quantity demand (QD) for its product is QD = 800 – 0.25 × P (where P is price). The slope of the marginal revenue curve is closest to:

选项：

A.–0.25. B.–8.00. C.–4.00.

解释：

Solution

B is correct. Solve for P from the quantity demanded:

Q = 800 – 0.25P

P = 3,200 – 4Q

TR = P × Q = 3,200Q – 4Q2

MR = ΔTR/ΔQ = 3,200 – 8Q

Therefore, the slope of the curve is –8.

A is incorrect because it is the slope of the quantity demanded.

C is incorrect because it is the slope of the demand curve (–1/0.25) when P is a function of Q.



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1 个答案

笛子_品职助教 · 2023年03月15日

嗨，爱思考的PZer你好：


这题的3200哪来的？


Hello，亲爱的同学！

3200元是公式变形得出来的。


我们已知：

Q = 800 – 0.25P

那么把这个公式进行变换


把P移到右边：0.25P = 800-Q

等式两边同时乘以4：P = 600*4 -4Q，得出：P= 3200-4Q

----------------------------------------------
虽然现在很辛苦，但努力过的感觉真的很好，加油！

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NO.PZ2022071403000039 问题如下 Question A power generation company is a monopoly thhvery high barriers to entry. The quantity man(Q for its prois Q= 800 – 0.25 × P (where P is price). The slope of the marginrevenue curve is closest to: A.–0.25. B.–8.00. C.–4.00. SolutionB is correct. Solve for P from the quantity manQ = 800 – 0.25PP = 3,200 – 4QTR = P × Q = 3,200Q – 4Q2MR = ΔTR/ΔQ = 3,200 – 8QTherefore, the slope of the curve is –8.A is incorrebecause it is the slope of the quantity manC is incorrebecause it is the slope of the mancurve (–1/0.25) when P is a function of Q.

2023-03-26 08:32 1 · 回答

NO.PZ2022071403000039 问题如下 Question A power generation company is a monopoly thhvery high barriers to entry. The quantity man(Q for its prois Q= 800 – 0.25 × P (where P is price). The slope of the marginrevenue curve is closest to: A.–0.25. B.–8.00. C.–4.00. SolutionB is correct. Solve for P from the quantity manQ = 800 – 0.25PP = 3,200 – 4QTR = P × Q = 3,200Q – 4Q2MR = ΔTR/ΔQ = 3,200 – 8QTherefore, the slope of the curve is –8.A is incorrebecause it is the slope of the quantity manC is incorrebecause it is the slope of the mancurve (–1/0.25) when P is a function of Q.

2023-03-15 09:25 1 · 回答