The huge difference between the large business corporations of today — which effectively set the economic scene for the whole world — is that each of them only have one ambitious leaders at the top. Bearing in mind that every hunter-gatherer group depended on having at least one ambitious person per ten or twelve mature adults, then where are all the ambitious males in a modern corporation?
They are, of course, scattered about at all levels within a large corporation — indeed, in every very large organisation — for example, the UK civil service, or the National Health Service. All the ambitious males, frustrated by lack of sufficient routes to the very top do the next best thing and build up their own departments in order to gain personal power — and, of course, earnings.
Ever since the beginning of civilization abut 8,000 years ago its by-product, empires, have never lasted for long. Internal inefficiency grows, as does dissention between frustrated males. Their demise is inevitable. A warning sign to prime ministers and chief executives? Not that you’d notice so far.