Bob, you having been a MM will know more than most, so I have a genuine question for you.
Current research has led me to believe that there can be far better opportunities trading SPX options at certain times compared to SPY or ES - would you agree with this assumption, or am I just making an error for whatever reason?
Also, how important really is OI, for there are times I called the friday level more or less spot on based on OI values, and other times it didn't work at all - do certain values really matter, or do you need to look at something else in conjunction with the OI levels on expiration day?
Thank You,
J_S