Fundamentally, the more value you create, the richer you become. If you take two equal cave-men, and one builds a house and start farming stuff and the other no

Fundamentally, the more value you create, the richer you become. If you take two equal cave-men, and one builds a house and start farming stuff and the other not, then suddenly you have one rich that possesses all the value in the world, and one poor guy that has nothing. There is nothing wrong in this dis-balance, it's just natural. The rich one did not steal from the other and does not owe him anything. So the right question is "What prevents the other caveman from creating value?". Historically it was access to resources, how the climate favored access to food, etc... But now that science and technologies can do wonders, we are indeed often left with political barriers to the development.