a/ everyone is tripartite
b/ every now and then, mid and high circulate, often by appeal to the low
c/ as soon as the old mid becomes the new high, they forget their promises
which is completely in keeping with what he said in Animal Farm. (did he have a third book on the topic?)
{a: PIE, b: Veblen, c: Machiavelli}?
(I recently learned the chinese latin TLA "SPA" from a Zhihu question about the PRC equivalent of the low)
* not completely fast forward: one sentence of the last narrative explains why the Man even bothers to keep the low down: https://news.ycombinator.com/item?id=40023059
EDIT: on Tripartism, yeah, a large part of our current "The Middle" party was previously known as Christian Democrats.