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ancient hunter-gatherer bands were still more egalitarian than any subsequent human society, because they had very little property. Property is a prerequisite for long-term inequality. ... Following the Agricultural Revolution, property multiplied and with it inequality. As humans gained ownership of land, animals, plants and tools, rigid hierarchical societies emerged, in which small elites monopolised most wealth and power for generation after generation.

the combined wealth of the bottom half of the world's population (over 3.6 billion people) is the same as that of the world's eight richest people

All babies are born naked, but soon after some are dressed in expensive clothes bought at the best boutiques while the majority wear rags. Once they've grown a little older, some get annoyed every time relatives and godparents bring them yet more clothes, since they would prefer other gifts, such as the latest iPhone, while others dream of the day when they might be able to head to school without holes in their shoes.