Final answer:
Richard Lee's field studies indicated that as band-level societies grow in population, interpersonal conflicts increase due to less personal connection and increased competition over resources.
Step-by-step explanation:
In his field studies of the Ju/'hoansi, Richard Lee observed that with the increase in population size in band-level societies, there's a rise in potential for disruptive interpersonal conflicts. This phenomenon highlights the tension that arises as a larger number of non-kin contacts increase, leading to disagreements and conflicts due to reduced levels of personal relationships and kinship bonds which are more prevalent in smaller, kin-based groups. Lee essentially found that as societies grow in number, conflicts become more likely because there is less personal connection and more competition over resources.