There's no need for a single reserve currency. From a long-term...

From a long-term perspective, our current situation is quite bizarre, and likely unstable. The US is no longer economic or military hegemon, it is rapidly losing geopolitical power, the $ has no asset backing & the US is abusing
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I realize that people look at the moment in history they happen to be living in & think that is the natural state of things, but we are in a deeply unnatural place & it will change
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The hour is later for the USD than most realize.
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