I want to know the answer to the following question:
What other characteristic is variable for these groups?
All the background I'm provided with is that "At the 1966 "Man the Hunter" conference, anthropologists Richard Borshay Lee and Irven DeVore suggested that egalitarianism was one of several central characteristics of nomadic hunting and gathering societies because mobility requires minimization of material possessions throughout a population.". Is that enough to answer the question?
Answer: no