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Arguments for the Amero: United States / Canada
United States:
One argument for the United States to press for the adoption of a North American currency is the fact that it would essentially make Canada and possibly Mexico a monetary dependency of the United States which could thus be exploited for political and economical gains.
Secondly, given the euro's new prominence, a dollarization policy adopted by either Canada or Mexico, or even a change to the proposed amero, could help reassert the dollar's dominance world-wide.
However, it is unlikely that this would be sufficient to counter the threat of another global currency if only two nations (the United States and Canada) were to adopt it.
Canada:
One argument is that it would save up to 3 billion dollars in currency transactions. The same authors also stated that Canada's GDP could rise by up to 33% in a twenty year period given the adoption of a single currency.
The idea of a common currency receives more support in Quebec than in the rest of Canada, with over half of the population being in favour of it.