Another way to look at it, is that there are people and there are things. Humans will inevitably have to interact with each other, at least in order to mate to

Another way to look at it, is that there are people and there are things. Humans will inevitably have to interact with each other, at least in order to mate to prevent the species from dying out. Arguably, everything involving people is communication overhead, the larger the organisational structure, the more communication overhead. Anything non-people related are "things". This includes anything from planning, math, engineering, logistics, marketing.