- Comparing the size of our neocortex to other primates and the sizes of the groups in which they dwell suggests the natural size of a human group is 150 people (Dunbar, 1992).
- Computer simulations show that the evolution of risk aversion happens only in groups of about 150 people (Hintze, Olson, Adami, & Hertwig, 2013).
- The average size of modern hunter-gatherer societies is 148.4 people (Dunbar, 1993).
- Neolithic villages in Mesopotamia had from 150–200 people (Oates, 1977).
- When a group of people exceeds 150-200 people, it will tend to break into two in order to facilitate greater cooperation and reciprocity among its members (Chagnon, 1979).
- The average personal network, as suggested by the typical number of holiday cards sent per person per year, is 153.5 people (Hill & Dunbar, 2003).
Any more than that, crazy comes into play.
Works for me. :)














