The evidence is that newly minted millionaires in the USA is constantly rising; never mind the Harvard drop-out who became a billionaire this year, making the myth a reality. And, would not mathematics prove that inequalities would necessesarily be larger in the richest country in the world, containing the majority of the world's wealth, not to mention the source of the creation of the majority of new wealth in the world? Might it also be possible that (human nature being what it is) the "myth" of American exceptionalism becomes a self-fulfilling prophecy for the hard-working and/or lucky? Could it also be possible that the poor are poorer because of the inability of America to ditch the current 19th Century educational model that is a victim of political decisions that result in standards and outcomes that are ever falling to lower and lower levels?
If the Gold Standard is a bad idea, then let European banks sell their gold reserves to those who wish to buy them (China and other net importers of gold) to make themselves whole again. In a world where gold, oil, and corn are at record highs, would not cost-push inflation eventually accomplish the required leveling of deflation? And, would allowing a second tier of national currencies to be slowly introduced in an orderly manner be as bad as the opponents of the "Free Silver" movement in 19th Century America thought it would be?