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In reply to the discussion: RBS will leave Scotland if voters back independence [View all]muriel_volestrangler
(101,320 posts)The idea is that the EU wants new members to stabilise their currency, and move to joining the euro at a stable rate.
The Yes campaign doesn't want to use the Euro - since Greece and other countries (especially Ireland, on which the SNP wanted to model the Scottish economy) showed the downsides of being a small Euro country in difficult times, it stopped looking attractive. But even if it did, as the link FrodosPet gives above says, the EU wants the countries to have an independent national central bank, which the Yes campaign's currency union with rUK would not be, before merging.
If Scotland didn't want to be in the EU at all, it could use the Euro like the Vatican - but that would guarantee all the banks moved their headquarters into England, where most of their work, denominated in sterling, is. And most of Scotland's exports would be to rUK, so they'd give themselves exchange costs and inconveniences.