Well as to your first part you’re looking out at as a matter of economies of scale. So the more kids you have the lower the unit cost is. Kind of like manufacturing millions of cookies in a factory versus making a dozen at home. The unit cost becomes cheaper when you make millions. Got it so it’s an economic decision then. As to your second part who’s going to take care of you when you’re old? So you had children as an insurance policy or Hedge for failing health in old age. Got it.
I doubt someone with a bunch of kids is going to give them much help and their life will be a struggle to say the least.