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菱秋秋 · 2021年10月04日

B\C\D选项都不是太懂,麻烦可以解释一下原理吗?

NO.PZ2020042003000026

问题如下:

To unwind a large position, which of the following statements is NOT correct?

选项:

A.

If the position is unwound quickly, the trader will face large bid–offer spreads, but the potential loss from the mid-market price moving against the trader is small.

B.

When Deciding how to liquidate a large position over an n-day period, a trader might reasonably wish to minimize VaR after trading costs have been considered

C.

When a position is to be closed out over n days, more than 1/n of the position should be traded on the first day

D.

when unwind a large position over n days, As the VaR confidence level is reduced, the amounts traded per day show more variability.

解释:

考点:对Liquidity Trading Risk的理解

答案:选项D描述错误,因此本题选D

解析:

关于D选项,正确的表述为:As the VaR Confidence level is reduced, the amounts traded per day show less variability.

也就是当Confidence level降低时,每日“最优交易量”之间的差距会变小。

B\C\D选项都不是太懂,麻烦可以解释一下原理吗?

1 个答案

李坏_品职助教 · 2021年10月04日

嗨,努力学习的PZer你好:


B的意思是,当决定如何在n天时间内平仓大量头寸时,交易员希望在考虑到交易成本后,将这笔平仓交易的VaR降至最低。意思就是交易员需要把平仓带来的风险降到最低,尽可能不要带来太大的VaR。这句话是正确的。


C的意思是当一个头寸将在n天内平仓时,超过1/n的头寸应该在第一天进行交易。这句话是正确的,也是原版书里面提到的:


D的意思是对于一个很大的头寸,随着VaR置信度的降低,每天交易的金额显示出更多的可变性。这句话是错误的,它把原版书的原话说反了:

原版书后面还有具体的计算案例,大意是随着置信度的降低,比如从90%降到75%,VaR的数额应该是降低的,由此(更低的VaR)计算出来的每日交易量的变化也应该是更小的才对。

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