This is a really unique idea! Every time I think I understand how everything works, I seem to come across something new to discover. Great job!
In the "Build" step, it says that you cannot have more Mills than Shareholders in Recycling. Does this just apply when you are building a new Mill, or for all future turns (i.e. if I have 2 Mills on the map, does that mean I must always keep at least 2 Shareholders in Recycling)?