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But such discussions of "optimal currency areas" are academic.
According to the theory of optimal currency areas, a central fiscal policy is necessary because a single interest rate will not suit conditions in all parts of a currency zone.
Even so, there is a worrying lack of the labour mobility that Robert Mundell, the Canadian (like Mr Carney) founder of optimal currency theory, identified over 50 years ago as a crucial ingredient for success.
According to the theory of optimal currency areas, which Columbia's Robert Mundell helped to pioneer, for a common currency to succeed its member countries must enjoy similar business cycles, plus they must have a system of risk-sharing and fiscal transfers to help out less competitive countries during a recession.
The theory of optimal currency areas was pioneered by Mundell (1961), McKinnon (1963) and Kenen (1969).
Also unsupported by the application of a Coasian methodology are claims that CBSes or dollarization will fail to produce deserved results because they don't protect countries from external shocks; they don't have adequate lender of last resort facilities; and they are not part of optimal currency areas; and they cannot be established because countries don't have adequate foreign reserves.
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And the economist was Robert Mundell, whose work on "optimal currency areas" led ultimately to the creation of the euro.
He chose to do that by giving an erudite but yawnsome lecture on "optimal currency areas".
It was on "optimal currency areas"—that is, on the criteria that should decide whether exchange rates among any group of countries should be fixed.
There is some debate as to whether the euro area qualifies.Among the keys to making shared currencies work, according to Robert Mundell, the godfather of optimal-currency theory, is a mobile workforce.
Few single countries would meet the academic criteria for optimal currency areas.
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