There’s indeed an order book that’s “public enough”, but not every trading system enters every intent into the public order book. (Even as a retail nobody, I can create contingent orders that only become public orders once the trigger conditions are met.) I also don’t believe that individual bid/asks can be traced to a specific bidder.
Further, block trades are negotiated off-order-book and later reported.
> Even as a retail nobody, I can create contingent orders that only become public orders once the trigger conditions are met.
Do different brokers implement this differently, or is this an a property of the exchanges themselves?
In terms of links, I don’t have a ready primer to vouch for. I worked 6 years in online broker tech, but it was decades ago.