That collective effort resulted in something very impressive, but there are lots of achievements in the present day which are, organizationally, at least as impressive, and which do not seem to require hierarchy (though they include various hierarchies). The chain of processes and activities that result in a modern supermarket and all its products, for example, has no overarching boss, and some of the steps along the way are handled by self-employed people (truck owner-operators, for example).