Our maps are inherently subjective constructions. They are simplified, perspective-bound representations created by minds with particular viewpoints and limitations. The territory (reality itself) exists objectively, independently of our perspectives, and would continue to exist even if no minds were around to map it.
Some aspects of maps are social convention. (North at the top of the page, water features in blue). And all maps are edited to leave out what the compiler considers unimportant.
On the other hand, if you've ever had the experience of trying to navigate with a map that fails to correspond with the territory (e.g. showing a footpath where in reality a brick wall prevents access) then you'll appreciate that maps can be objectively wrong.
The study of hierarchies and structures is anthropology, specifically social anthropology. I'm not a professional anthropologist nor sociologist however I have heard that no human society has ever been recorded as lacking a socially elite class.
I was recently reading Jared Diamond ("Guns Germs & Steel") who was suggesting that humans originally existed as small bands of nomads, each an extended family, with no authority-structure. (Which does not imply that all humans had equal say in every decision, but rather that the only power was personal power - strength, charisma, willpower - rather than role-authority).
He posited a development path from small units to large - bands to tribes to "chiefdoms" to nation-states. With one of the developmental stages being hereditary chiefs with the chief's family forming an elite class. And a later stage expanding that elite class to be all those who are part of the structure of government (and thus neither produce their own food nor obtain food by a voluntary process of trading their craft-products).
His work was informed by study of the many tribes of New Guinea.
"Opinions are fiercest.. ..when the evidence to support or refute them is weakest" - Druin Burch