Quote from Maverick74:
You obviously do not understand a single thing about the greeks. Theta is not an edge. It's a function of volatility. Volatility is a function of delta. Delta is a function of price. The delta of any given option is priced very efficiently as to not favor the buyer or the seller.
If what you are saying is true. One could trade synthetics to make millions. What you are saying is that selling a 20 delta option has some sort of implicit edge. That would mean one could sell any given option and buy it's synthetic counterpart for a risk free profit. Obviously if you understand put-to-call parity, you would know this is not possible.
Quote from tower:
While I agree that Theta is not an edge. I do not believe your statement that "the delta of any given option is priced very efficiently as to not favor the buyer or the seller" is correct.
Specifically, I believe that the price of low delta options are heavily skewed in favor of the buyer. If an option has a delta of 1 - then it is defined as having a 1% chance of settling ITM. Right now you can probably buy a 1% delta put in the S&P's for .10. I believe this premium dramatically understates the value of this put. Put another way, I do not think that .10 adequately compensates the writer of this option for the risk he is assuming.
We are one Long-Term Capital, 9/11, Bird Flu epidemic, successful attack on our food supply, etc. away from a catastrophic and discontinuous break in the markets.
If one of these, or any other, "once in a lifetime" event occurs, that put might be 100 points in the money with volatility moving to 35% over the course of 1 hour with no opportunity for the writer to cover.
So when you say that the price of an option does not favor either the buyer or the seller, I would have to respectfully disagree.
Quote from tower:
While I agree that Theta is not an edge. I do not believe your statement that "the delta of any given option is priced very efficiently as to not favor the buyer or the seller" is correct.
Specifically, I believe that the price of low delta options are heavily skewed in favor of the buyer. If an option has a delta of 1 - then it is defined as having a 1% chance of settling ITM. Right now you can probably buy a 1% delta put in the S&P's for .10. I believe this premium dramatically understates the value of this put. Put another way, I do not think that .10 adequately compensates the writer of this option for the risk he is assuming.
We are one Long-Term Capital, 9/11, Bird Flu epidemic, successful attack on our food supply, etc. away from a catastrophic and discontinuous break in the markets.
If one of these, or any other, "once in a lifetime" event occurs, that put might be 100 points in the money with volatility moving to 35% over the course of 1 hour with no opportunity for the writer to cover.
So when you say that the price of an option does not favor either the buyer or the seller, I would have to respectfully disagree.

Quote from IV_Trader:
Notice that this thread has all ET records ( # of views , pages , replies) , so I guess a lot of people here would disagree with you![]()
Quote from momoneythansens:
IV, don't you get tired of bashing the folks on the SPX credit spread thread LOL?
Black swan risk is discussed regularly on that thread; they are not ignorant of the dangers but prefer to take their chances...and the money, 90% of the time.
Die thread die. I think Tower is on a mission to revive hundreds of old threads.

