A post on the IMF Blog on 25th July says that a curious thing has happened in US currency: the $100 bill recently overtook the ubiquitous $1 bill in circulation volume, for the first time in history. In other words, the most valuable banknote in the US became the most widely circulated- and roughly doubling in volume since the global financial crisis.
https://blogs.imf.org/2019/07/25/us100-bill-on-the-rise/
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