|Source: Table H-12|
In the millennia-long[*] evolution of human societies and economic systems, many things have changed. One thing, however, hasn't: there are two kinds of people. There are those being screwed (call them slaves, serfs, workers if you wish), and those doing the screwing (i.e. slaveholders, feudal lords, capitalists, respectively). For short, let's call the former group the "screwees" and the latter, the "screwers".