Rebranded the idea of trickle down.

The concept has existed since the late 19th century; it was formerly called "Horse and Sparrow Economics," as the horses eat the whole grains, and sparrows peck their meals from the horseshit.

The Currency's value is not based on government decree but they do have the ability to alter it by changing the money supply though the value can change independent of their actions. Frankly, having a fiat currency that represents a portions of that nations economic output makes alot more sense than something like precious metals but the guardians of that fiat currency in the US have class interests that stand at odds with most of the country and the use of the US dollar as a reserve currency was a temptation that America couldn't handle.

No, all those graphs tell very different stories and even if they did, it wouldn't inherently mean the transition to fiat was the problem.

Because policies and actions are always instantly felt and measurable.