Quote from exQQQQseme:
Actually, Smililngsynic agreed with me in stating that there was a visual relationship. That's all I was getting at. No need to go on an assumption spree. My posting doesn't warrant that much effort.
Bob
Yes, there are some similarities, but they are very different in risk. A calendar/time spread's risk is limited to the debit (the amount paid to put it on). The risk is limited because the longer term option will always have more or equal value than the shorter term one.
An example of a calendar is buy March ES 1425 put, sell February ES 1425 put, hoping that ES will trade around 1425.
Writing a straddle entails UNLIMITED risk, unless one buys otm options (sometimes called "buying the wings"). There is a journal here devoted to SPX credit spreads, where this strategy is discussed. An example of a short straddle is sell February 1425 puts and sell February 1425 calls.
For both the calendar and the short straddle examples, the trader wants ES to trade around 1425. If ES moves far away from 1425, both the long calendar and the short straddle will be losers.
Worst case scenario, for the calendar: at exp both Feb and March puts trade at the exact same price (either real high or real low, like zero).
Worst case scenario for the short straddle writer: ES trades far, far away, at a much higher volatility. Writing a straddle for 40 and buying it back at 80 or higher is possible (not often, but it happens). Those who write straddles are prepared to hedge by either (1) buying volatility and gamma--buying options; and/or (2) hedge (replicate) with the underlying.
For the calendar, the trader wants ES volatility to increase as it trades toward 1425. For the straddle writer, the trader wants ES volatility NOT to increase.
Writing straddles is for advanced traders only who are willing to take an occasional big loss in order for the high probability of a small but limited profit.
Calendars are better for beginners, but only risk capital should be devoted to options.
Ursa--glad to have you back here. I always liked your posts over at google.