Luc's Limit
Luc's Limit states that management groups larger than about 200 invite corruption and inefficiency. Barry Clemson. More in details
200 or so is about the number of people who, working together, can get to know and trust each other. More than that and dysfunctions, inefficiency, and corruption inevitably creep in.
This suggests a limit for the size of worker owned and managed firms UNLESS they are structured recursively.
This implies that very large organizations must be changed from hierarchies to being structured recursively (Stafford Beer, Viable System Model).