Quote from Carry:
Do you know if these automated programs are programmed to buy fixed quantities of stock just once from trigger until the return to fair value OR if they keep buying more tick by tick while the premium is above the trigger point (or maybe above fair value)?
Do you know if there are any other finer points to Program trading in general? (eg: buying may only commence if the trigger point is exceeded for a duration of at least two ticks)
Good questions, and truthfully I don't have any answers that I can give with perfect certainty. When I did this kind of trading, we did not do it the same way as I described. We were not big enough (and we were plenty big....maybe in another post I will talk about how we did do it).
But as far as the answers I would think are "safe" for you, in the case you give, where the premium stays high enough, I would guess they could keep buying stock and selling futures. I don't see any risk in this, because at expiration, the fair value will be at zero.
As to the "finer points" question, yes, duration is definitely a factor. They need to recognize if there is enough volume on the buy side (futures) to be sure they can sell. Enough stock to sell as well. I am guessing here....(I haven't actually participated in this since 1990) that representative baskets of stocks are used more now than the actual total basket .... all 500 stocks. So many of them, especially now, are very low priced, not that liquid, and don't move enough and are not weighted enough to make any significant difference.
Today's technology is so far advanced from 1990 that I am sure everything is much cleaner, simpler, faster. More accurate, and more efficient in every way.
Look at our own technology. And costs. As a market maker, I paid First Options (our clearing firm) almost $2 a contract to clear our trades on options. (thousands of contracts a day). Today anyone can get a better rate at home. Our Reuters quote machine that did simulations was an extremely hot machine (Shwartzatron)..... a very expensive 386 processor with a math coprocessor. And I think 2 or 4 megs of RAM. Clock speed maybe 33Mhz.? Can't remember exactly, but it was hot stuff then, and you wouldn't use it as a paperweight now.
Peace,

Rs8.5