Shelley
2018-12-20 14:54老師您好,您能解釋一下page 31頁,我用黃色筆標注的地方嗎?謝謝您! In the case of a portfolio consisting of a risky asset and a risk-free asset, the return to a rebalanced portfolio can be replicated by creating a buy-and-hold position in the portfolio, writing out-of- the-money puts and calls on the risky asset, and investing the premiums in risk-free bonds. As the value of puts and calls is positively related to volatility, such a position is called being short volatility (or being short gamma, by reference to the option Greeks).
所屬:CFA Level III 視頻位置 相關試題
來源: 視頻位置 相關試題
1個回答
Irene助教
2018-12-24 09:39
該回答已被題主采納
同學你好。
這個就是用call和put來復制rebalance的過程。Rebalance就是說漲到一定的價格,或者跌到一定的價格要買。
那么漲到一定價格要賣,可以用write a call來復制
跌倒一定價格要買,可以用write a put來復制
但是因為write的時候會產(chǎn)生premium,所以這部分premium就用來買risk-free bond了。
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追答
然后因為put 和 call的premium都會隨著volatility的上升而上升,所以如果是long方的話,相當于long 波動率,因為會在波動率上升的時候賺錢。而short 方的話,就相當于short波動率
