When the Euro happened, there was widespread belief in the market that it was the way to go. There were talks about a South Asian currency or even a South East Asian currency. What was never thought about was how different countries developing at different pace, different societies and political situations could band about on a common currency.
A good article here mentions about the top 10 reasons why the Euro will fail. You can supplement these theories to other economies too and see why the fundamental argument for a common currency is a non-starter.
1. One interest rate cannot be suitable for everyone
Quite simply if there is a single currency there must also be a single interest rate set by the European Central Bank. For the single currency to work, this single rate must be suitable for all member states. It is difficult to see how a single rate could possibly be suitable for all of the economies in all foreseeable situations. Take for example Germany and Ireland in 2001. The German economy is on the brink of recession while the Irish economy is booming. The Germans would ideally like a low rate while the Irish needed a higher rate. The compromise rate is not suitable for either Ireland or Germany. This shows that in the long term the result is painful for both countries as both countries have an unsuitable interest rate. One size cannot fit all!
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Above picture courtesy: Bized