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徐威廉 · 2024年10月27日

这题有问题吧

NO.PZ2024042601000074

问题如下:

Six months ago, Textile Manufacturing Inc. (TMI) entered into a 9-month forward contract with Spin Mills Company (SMC) to purchase 36,000 tons of yarn. At the time the forward was entered into, 36,000 tons of yarn was priced at EUR 92.0 million but is currently priced at EUR 94.0 million. The continuously compounded risk-free rate has remained stable at 3.0% per year and is not expected to change during the entire contract period. Assuming the forward is fairly priced, what is the current potential credit risk exposure on the forward contract and who bears the risk?

选项:

A.

EUR 0.610 million; TMI bears the potential credit risk

B.

EUR 0.610 million; SMC bears the potential credit risk

C.

EUR 1.308 million; TMI bears the potential credit risk

D.

EUR 1.308 million; SMC bears the potential credit risk

解释:

A is correct. Given the risk-free rate of 3.0%, we can estimate the forward price (at maturity, in nine months) of the contract as:

Forward price = Spot*exp(r*t) = 92.0*exp(0.03*0.75) = EUR 94.093 million.

Today, after 6 months (3 months to maturity), the forward contract price estimate = 94.093/exp(0.03*0.25) = EUR 93.39 million.

Note that, Forward Contract Value = Credit Risk Exposure;

Therefore, given that the current (with 3 months remaining to maturity) underlying asset price of EUR 94 million, the long forward contract’s value is given by:

Current Value of Forward Contract = (Market Price – Contract Price)= 94.0 – 93.39 = EUR 0.610 million, which represents exposure, and is the value to the long (TMI) because the contract is a claim on the asset, which is currently worth EUR 94.0 million, and an obligation to pay EUR 94.093 million for it in 3 months. Because the contract value of EUR 0.610 million is positive, the long counterparty (TMI) bears the credit risk exposure.

Positive exposure = Max(value, 0)

Negative exposure = Min(value, 0)

And for forward contracts: Contract Value = (Market Price – Contract Price).

For forwards, while there is no current exposure (because payment is only made at expiration, there is always positive potential exposure so long as market price > contract price, and negative potential exposure if market price < contract price. At origination (time 0), there is neither current nor potential exposure (since market price = contract price).

B is incorrect (see explanation above).

C and D are incorrect. They compute the contract price incorrectly by discounting the forward value over 6 months and not 3 months:

The forward contract price = 94.093*exp(-0.03*0.5) = EUR 92.692 million. Therefore, Current Value of Fwd Contract = (Market Price – Contract Price) = 94.0 – 92.692 = EUR 1.308 million.

在0时刻TMI进入这份合约约定好9个月以后以92元的价格买yarn,这个92元就是 t=9时刻的forward price, 而今天站在t=6时刻, 3个月以后的forward price 也就是 t=9的新forward price涨价到 94元, 所以94-92 = 2 gain再折现回t=6时刻, 2/ e^3%x3/12 = 1.985million

2 个答案
已采纳答案

pzqa27 · 2024年10月29日

嗨,爱思考的PZer你好:


在这个问题中,TMI在6个月前进入了一个9个月的远期合约,约定9个月后以92百万欧元的价格购买36,000吨纱线。我们在t=6时刻(距离到期还有3个月)重新计算远期合约的价值。

但是,你的计算方法和解释中有一些混淆。我们并不是将94减去92,再折现回到t=6,而是要先计算当前(即t=6)基于3个月剩余期限的远期合约价格,然后计算它与市场现价94之间的差额。以下是详细的计算过程:

计算步骤:

  1. 计算9个月后的远期价格(t=9): 使用起初签订合约时的市场价格 Spot=92\text{Spot} = 92Spot=92 和年化连续复利无风险利率 r=3% 来估算远期价格:Forward price = Spot*exp(r*t) = 92.0*exp(0.03*0.75) = EUR 94.093 million.
  2. 计算在t=6(即现在)远期合约的3个月价格(t=9): 我们将未来3个月的远期价格从94.093折现回当前(t=6)价格,折现期限是3个月 94.093/exp(0.03*0.25) = EUR 93.39 million.
  3. 计算当前的合约价值: 现在的市场现价为94,因此,合约的当前价值可以表示为:Current Value of Forward Contract=94−93.39=0.610million EUR

由于合约价值为正,这表示TMI持有合约的正向价值,因此TMI承担潜在的信用风险

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努力的时光都是限量版,加油!

徐威廉 · 2024年11月02日

您这个第一步是有问题的,在6个月以前,也就是t=0时刻,约定的92这个价格是Forward rate,怎么可能是spot rate呢,这个远期合约的含义不就是在t=0时刻约定好9个月以后TMI给对手方92million,买回对应的货嘛。

pzqa27 · 2024年11月04日

嗨,从没放弃的小努力你好:


“At the time the forward was entered into, 36,000 tons of yarn was priced at EUR 92.0 million" 题目原文是这么写的当进入forward 合约的时候, 36000 吨的yarn的价格是92m, 这个92m指的是签订合约时的现货价格。

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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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