Don,
when you said "NYSE stocks may open at 9:30 or 9:35 etc., based on order flow etc.", does it mean there are two exchanges that have open auction? in that case, how can they assure the open price is the same? if not, then the data we often use in technical analysis including open,high,low,close may have to be reconsidered about its reliability.
when you said "NYSE stocks may open at 9:30 or 9:35 etc., based on order flow etc.", does it mean there are two exchanges that have open auction? in that case, how can they assure the open price is the same? if not, then the data we often use in technical analysis including open,high,low,close may have to be reconsidered about its reliability.