It's not entirely zero though. I learned/was reminded of this by 'Capital in the 21st century': Poor people make up society, when they are pushed over a certain

It's not entirely zero though. I learned/was reminded of this by 'Capital in the 21st century': Poor people make up society, when they are pushed over a certain line of comfort they will apply pressure to the system to rectify. In these situations rectification can mean one of several things: Decapitating all who are or seem to be in power or inflating currency until being rich loses its meaning. Obviously those two solutions are not very attractive to the capitalist market players, so there is an incentive to form structure with the goal of sustaining society. Though history shows capitalist markets are not good (enough) at forming that structure (thus their heads roll).