They also tend to be resurrected once outside the immediate lifespan of people who lived through them. For example, "trickle-down economics" was once called "h

They also tend to be resurrected once outside the immediate lifespan of people who lived through them. For example, "trickle-down economics" was once called "horse and sparrow theory" back when the idea was popular in the 1800s. https://en.wikipedia.org/wiki/Trickle-down_economics https://en.wikipedia.org/wiki/Trickle-down_economics (where did "trickle down" come from anyway? Well, if you feed the horse enough oats, there will be some left for the sparrows. That's what's "trickling down".)