With Catalonia, Spain and the EU in the news perhaps time to dust off useful article about optimal currency zones?
Interesting article by Keynesian economist Paul Krugman on why the Euro may or may not have created problems for its member states; or why the USA might break up. Worth using the article to think about our own currency union - the pound. Do we have an optimal currency area in the UK or will Scotland leave the Pound?
http://krugman.blogs.nytimes.com/2012/06/24/revenge-of-the-optimum-currency-area/
The creation of the Euro-zone will create an optimal currency zone: http://www.bbc.co.uk/news/business-13893034
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