Quote from Trader13:
Don, would you classify this tactic as an implementation of Game Theory?
Sounds like a great example of Game Theory: understanding the mechanics of the process (rules of the game) to exploit an inefficiency (opportunity). Not much different than a floor trader who sees a large broker entering the pit, providing an indication of where order flow is headed. This tactic is also playing the "game" based on knowledge of the rules and behavior of players, a source of edge when the circumstances are just right.Quote from Don Bright:
Actually not nearly as complex. Simply understanding how this "game" is played (excessive orders that need to be offset by the Specialist, thus creating an edge by being on the same side on the opening).
Don
Quote from Trader13:
Sounds like a great example of Game Theory: understanding the mechanics of the process (rules of the game) to exploit an inefficiency (opportunity). Not much different than a floor trader who sees a large broker entering the pit, providing an indication of where order flow is headed. This tactic is also playing the "game" based on knowledge of the rules and behavior of players, a source of edge when the circumstances are just right.
These tactics are in a class of their own, quite separate from the more common speculation based on price and technical indicators.
Thanks for reply, Don. I'm just thinking out loud ...

Quote from Don Bright:
Remember this has zero to do with the price you cover at being at or near FV. You simply look for a "slingshot" retracement where the Specialist is likely to cover his shares...or, if themarke is going your way, then ride it longer.
Then it means that the beta (and correlation) of the stocks to the market should be 1 and this is not so. Even after major news being taken into account every stock reacts differently to an up/down open move and to general market news/sentiment on the day.Quote from lwlee:
...I would expect that my 5 sells would move towards their FV price (even if it's a brief period of time) rather than being pulled up by market direction. I'm not convinced this is happening.
Quote from total_keops:
Then it means that the beta (and correlation) of the stocks to the market should be 1 and this is not so. Even after major news being taken into account every stock reacts differently to an up/down open move and to general market news/sentiment on the day.
Quote from Don Bright:
We don't concern ourselves about overall beta for this. Just the one event "beta" if you will. We simply take advantage of the event when it occurs. When I was running a post on the exchange, the NYSE Specialist for Unocal would tell me pre-market if he had excess shares to buy or sell, and if Iwould like to offset these trades. I would respond with ok (stock closed at $30. for example), I would offer 10,000 at 30.50, 10,000 at 31 etc. ... if the stock opened at 32 for example) then I would be short 20,000 shares, along with the NYSE Specialist. I would then enter covering trades slightly lower, knowing full well that MOST of thetime, the Specialist would be able to cover his shares, as would I. Because HE determined the opening price (to some extent). Similar today, except no info from Specialists direclty, so we enter buys and sells AWAY from where the stock Should open (based on futures etc.).
Pretty simple overall... no need to "over-think" it ... it has a pretty good success rate in the long term, but does take more effort than in recent years (more data to deal with).
All the best,
Don