This is economics, not physics. Since we have institutions like the Fed and "fiscal policy" (where and if it differs from "government spends more money NOW") yo

This is economics, not physics. Since we have institutions like the Fed and "fiscal policy" (where and if it differs from "government spends more money NOW") you cannot have a widely accepted economic theory without influencing the economy. Two things immediately come up when looking at economic theories: 1) a LOT of them (the ones "followed") are "by" high-level Fed officials. Biggest example: Keynesianism. 2) They all seem to have the same conclusions (government needs to spend more, either directly or through the fed or finance dept) 3) because these people want to but can't be bothered to manage an economy (meaning hundreds of thousands of small companies) they massively advantage large corps over everyone else.