The rest of the world retooled after WW2. And they became more efficient and some nations-built products better.Too much power in the hands of the few, especially if there are no restrictions or controls of that power, will lead to a poorer society.
History has shown this to be true. Here is the perfect proof of that. The statistics do not lie:
Was the US economy good in the 1950s?
By the mid-fifties, the US manufactured 2/3 of all the world's goods. Unemployment was very low, personal income doubled and individual purchasing power jumped significantly. It was a decade of prosperity: the American Dream was becoming a reality.
and
When was the golden age of the US economy?
The Golden Age of Capitalism spanned from the end of the Second World War in 1945 to the early 1970s, when the Bretton Woods monetary system collapsed. It was a period of economic prosperity with the achievement of high and sustained levels of economic and productivity growth.
This was the era where the rich were taxed much higher than today and has less power than today. Where Democracy was at its best.
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and here more proof that Democracy works:
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