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Fiat currencies
Optimum currency area
In economics, an optimum currency area (OCA) or optimal currency region (OCR) is a geographical region in which it would maximize economic efficiency to have the entire region share a single currency.
Fiat currenciesRobert Mundell
Robert Alexander Mundell (October 24, 1932 – April 4, 2021) was a Canadian economist who was a professor of economics at Columbia University, McGill University, and the Chinese University of Hong Kong. He received the Nobel Memorial Prize in Economic Sciences in 1999 for his pioneering work in monetary dynamics and optimum currency areas.