Naively, how about a global tree? Suppose you have a group of 25 people, of which 1 (or more, all these numbers are fluid) is also a member in a group one "leve

Naively, how about a global tree? Suppose you have a group of 25 people, of which 1 (or more, all these numbers are fluid) is also a member in a group one "level" up which also contains 25 people all representing their own 25-person group. Then just keep adding more levels until everyone's in the tree. Importantly, these are not rulership positions. They're representatives representing the interest of their group one "level" down, which means these interests are sourced from the largest side of the tree and then negotiated/compromised as far up as is necessary. The reason I think 25 is the right number is because IIRC people are only capable of maintaining 50 close relationships, so the idea is generally most people are friends with their home group + extras. But doing the math on the number of groups required, let's say 8 billion / 25 = 320 million groups needing representation, and log_25(320000000) gives us a little over 6 levels required to represent them all (if I mathematically modeled that correctly), so even a top-tier representative can easily have a couple of close friends per level.