第179页 CS- The Neutral Calendar Spread

Neutral CS的建立：when the underlying stock is at or near the striking price of the options used.
此策略意在selling time, 不在predicting the direction.
在近期期权到期时，价格relatively unchanged，盈利！
创建neutral, one should initially have the intent of closing the spread by the time the near-term expires.
图形curved,因为远期月份期权仍有时间价值。
Call spread-->bullish bias
Put spread-->bearish bias
The profit rang extends slightly farther above the striking price than it does below the striking price. this is due to the fact that the spread is a call spread.