No, it's the economics. The inherently scarce number of "others" to work for you means not everybody can amass wealth. The ability to bring other non-human cate

No, it's the economics. The inherently scarce number of "others" to work for you means not everybody can amass wealth. The ability to bring other non-human categories of "others" can move the balance in the supply side (not necessarily talking about high tech, if you can train a horse - or pay someone who can - and ride it, you are ahead of the guy on foot, by example).