A relevant thought experiment:

How would you set up a social system, knowing that you would be reborn into it as a completely random member? That is, your chance of getting an education, having family stability, finding work and otherwise surviving being exactly in line with the way you set that system up from the beginning?

Secondarily relevant question: which existing system offers you the best probability of a satisfactory life given that random start? What features of that system make it better?