金同学2018-09-17 12:06:08

原版书课后第18题： Pierre-Louis Robert just purchased a call option on shares of the Michelin Group. A few days ago he wrote a put option on Michelin shares. The call and put options have the same exercise price, expiration date, and number of shares underlying. Considering both positions, Robert’s exposure to the risk of the stock of the Michelin Group is: A. long. B. short. C. neutral. 答案之中有一句是“The exposure as a result of the short put position is also long.” 如何理解这种一句话?