Lets say 5 close friends decide to implement this scheme for 10 dollars for every 7 days. That would mean:
1. week - member A is paid $40 by the rest of the group (B-$10, C-$10, D-$10, E-$10)
2. week- member B is paid $40 by A,C,D,E
3. week- member C is paid $40 by A,B,D,E
4. week- member D is paid $40 by A,B,C,E
5. week- member E is paid $40 by A,B,C,D