I believe the answer is: Meso level
Meso level cultures refers to a society that includes more than one families within one same territory.
Examples of meso level cultures include things such as school setting, company setting, tribes, community, small village, etc.
The Black Death is estimated to have killed 30–60% of Europe's total population. In total, the plague may have reduced the world population from an estimated 450 million down to 350–375 million in the 14th century.
The War Production Board?