Quote from jeb9999:
Your question makes no sense. The CME doesn't compute price it just reports it.
Quote from uexkuell:
So, if CME does not determine price who else?
To make my question more clear: There must be some computer on which a program is running that "decides" when to move bid or ask price.
Obviously it is not possible (for normal traders) to make trades outside of bid/ask.
So it is not any traders choice what trades happen but there is a matching algorithm running on their (CME or whereever) computers.
In other words they do not just "report" trades they somehow "arrange" them.