NO.PZ2019010402000030
问题如下:
A manager owns 500 shares of stock XYZ, the portfolio delta is 500, Deltac = 0.548, Deltap= -0.622. The manger could implement delta hedge by:
选项:
A.
selling 912 call options
B.
buying 912 call options
C.
selling 804 put options
解释:
A is correct.
考点:delta hedge
解析:
如果hedge工具是call,根据公式:
NH =- Portfolio delta/DeltaH =-500/0.548=-912,负号代表short,所以应该short 912 份call。
如果hedge工具是Put,根据公式:
NH =- Portfolio delta/DeltaH =-500/(-0.622)=804,正号代表long,所以应该long 804份put。
根据Delta put 的计算公式: Delta put = Delta call - 1 = 0.548 - 1 = -0.452
但这里delta put 给的值是-0.622
请问老师为什么和计算结果不同