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Evian, CFA2022-04-19 02:16:48
ヾ(◍°∇°◍)ノ゙你好同学,
A perfectly hedged position指的是:现有的投资状态将所有的风险对冲掉,没有波动和风险,可以获得无风险收益率。也就是这个题的含义。
(原版书定义)Derivatives usually take their values from the underlying by constructing a hypothetical combination of the derivatives and the underlyings that eliminates risk. This combination is typically called a hedge portfolio.A derivative’s value is the price of the derivative that forces the hedge portfolio to earn the risk-free rate.
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为什么错误定价消失后,就只能获得无风险收益了呢?
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If a risk-free position earns a return that is different from the risk-free return, arbitrage will lead to the elimination of the mispricing.
解析的意思是:
如果把“a perfectly hedged position”看成一个投资产品,这个投资产品的收益率应该是无风险收益率,如果不是无风险收益率,市场会存在套利空间,当套利进行之后,将套利空间消除,就会没有套利空间,这个投资产品的收益率就是无风险收益率。
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