问题如下:
What options positions are necessary to build a short position in a box spread?
解释:
Suppose K2 < K1 , A long box spread is created by buying a call with strike price K1 , selling a call with strike price K2, buying a put with strike price K2, and selling a put with strike price K1. A short box spread is therefore created by selling a call with strike price K1 , buying a call with strike price K2, selling a put with strike price K2, and buying a put with strike price K1 . All options have the same time to maturity.
这题难道不是k2大于k1吗?