The example pertains mainly to the progression of social structure formation, how it is a fact of nature that participants tend to cluster together and that this kind of division of labor is a necessary condition for economies to prosper. To map the conversation dynamics we would need to create a series of directed graphs (i.e. adding arrows between nodes) and from there we could solve the minimum-cost flow problem (find the cheapest possible way/the best delivery route for sending a certain amount of flow across the network); we would then find that since each cluster is a specialized group, there is no need to broadcast all information to everybody all the time -- a significant gain in efficiency.