RE: EZJ SP staggering5 Jul 2024 08:39
Once the call period finishes, the auction then enters a random 30 second uncrossing period before uncrossing.
The period before uncrossing is random because it ensures that only orders that are willing to be executed are on the book at this point.
If the uncrossing time was known, then everyone would either place their orders or withdraw their orders as late as possible in an attempt to game the system. The randomness ensures that nobody gets an unfair advantage.