As groups grow, internal cohesion weakens.
Unattributed. The mechanism is real and appears in Dunbar's layers and in span-of-control research, but no one has stated it as a testable law.
In practice
- A village hall committee of six that ran the fête for years cannot agree a date once it has grown to twenty-two.
- A working group of eight makes decisions in the room; the same group at thirty makes them in a subcommittee, and the thirty stop attending.