问题如下:
Consider a stock is currently priced at $20. An investor believes that the price will be volatile but not sure about direction. With this expectation, which of following strategies would enable the investor to have unlimited gains?
选项:
A. long
straddle
B. short
butterfly spread
C. short
straddle
解释:
A is correct
考点:straddle
解析:
当投资者预测价格波动很大且不确定价格变动方向时,可以使用long straddle 和short butterfly spread的头寸来获得收益。
但是short butterfly spread的收益是有限的,不符合题干中所说的unlimited gains的条件,所以B排除。
C选项不对,它正好说反了,只有当投资者预测市场波动很小时,才使用short straddle的策略。
Long straddle =long call + long put,其中call和put的执行价格是一样的。如果call和put的执行价格不一样,则称为strangle。
请问short butterfly spread 由什么组成