Quote from MasterAtWork:
Hi Dmo,
It's very interesting.
I've got some questions 'cause I think your way sounds interesting and pragmatic.
-How that way would you explain a smile?
-Options are traded since 600 BC. CBOT released puts around 1977 (there were only very active OTC markets before,... just like today LOL). Skew (smile, smirk....) appeared first time after 1987 stock markets crash. How would you please explain those facts the way your previous post?
Thanks
Skews in general predate the '87 crash. I don't know what the index option skews looked like before then, but it's hard to believe that every strike traded at exactly the same IV.
When I first stepped into the T-bond options pit in early 1984 there was sort of a skew - the ATM strike traded at a discount to everything else. I soon learned to buy the ATM's, sell the next strike out, and maintain it delta and gamma neutral until the futures moved to the next strike, and the pattern reversed. Pretty easy money.
The "modern" T-bond skew - somewhat resembling the SPX skew with the puts trading at a premium - was born in I think 1985. Charlie Cottle has a great section detailing the birth of the T-bond skew in one of his books. He has an amazing memory and I can verify that all his T-bond pit anecdotes are spot-on.
What I think happened - and this is just my opinion and feeling - is that prior to that time traders put excessive trust in pricing models. So they were overly willing to sell options that the model said were overpriced. When T-bonds hit bottom, the demand for puts became such that it "broke the back" of those who naively were anxious to sell puts for a small premium over what their model said they were worth. Perhaps something similar happened in index options during the '87 crash. That would make perfect sense.
When I first walked into the Comex gold and silver options pits in April 1987, that skew was firmly in place - OTM calls sold for a premium.
So it may be true that in the very early days of commodity options skews were somewhat "artifically suppressed" by a naive over-reliance and trust in pricing models. Once the bloom was off that rose however, the natural desire for "portfolio insurance" asserted itself and skews began to "float" to reflect it.