Two basic societal set ups.
OK I'm still on about: 'The Spirit Level - why equality is better for everyone' by Richard Wilkinson and Kate Pickett I do love a bit of evolutionary psychology. Off I go.... So there are egalitarian societies and those full of inequality. The book gives endless reasons for why the former is preferable (by demonstrating correlations between inequality and overall higher rates of: poor physical and mental health, mistrust in society, teenage pregnancy, violence etc etc) and giving reasons for why this might be so. Then as the book gets really juicy (in my books that means more theoretical) towards the end it delivers this.... We have the strategies to deal with very different kinds of social organisation. At one extreme, dominance hierarchies are about self-advancement, status competition and 'kicking' people lower down in the pecking order to maintain this status. In this society, individuals have to be self-reliant and other people are encountered mainly as rivals ...