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临江仙 · 2021年04月27日

麻烦老师解释下B选项,谢谢

NO.PZ2018122701000067

问题如下:

Model 1 assumes zero drift and is also called a normal model. Model 2 add a term for drift. Each of the following is true about these two models except for:

选项:

A.

A weakness of Model 1 is that the short-term rate can become negative.

B.

Model 1 implies a term structure that is perfectly flat at the current rate for all maturities, including the long-term rates.

C.

Model 2 is more capable of producing an upward-sloping term structure, which is often observed.

D.

Model 2 is an equilibrium model, rather than an arbitrage-free model, because no attempt is made to match the term structure closely.

解释:

B is correct.

考点 Term Structure Models

解析 Under Model 1, it is true that the middle node recombines to the same current node. But these are future short-term rates; they are not the term structure: the term structure is spot rates at all maturities. Models that take the initial term structure implied by market prices are called arbitrage-free models. A different approach, however, is to start with assumptions about the interest rate process and about the risk premium demanded by the market for bearing interest rate risk and then derive the risk-neutral process. Models of this sort do not necessarily match the initial term structure and are called equilibrium models.

B项看了不是很懂

1 个答案
已采纳答案

品职答疑小助手雍 · 2021年04月28日

嗨,从没放弃的小努力你好:


B字面意思是model1假设了利率曲线从始至终都是flat的,这显然是错的,因为model1有波动项的,利率曲线不可能是平的。

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努力的时光都是限量版,加油!

临江仙 · 2021年05月01日

光看到0drift去了,理解了

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