How Much Euro Membership Has Cost Ireland In Terms Of GDP

This is the problem with having a single currency.  You're not letting the Market set a value on what your economy is worth, and so your currency ends up being managed by a bunch of ministers in a far off land.  Instead of what's best for each individual country, they're concerned with what's best for the collective.
How many times after the fall of the Soviet Union do we need to prove that Collectivism doesn't work?
Broke: The Plan to Restore Our Trust, Truth and Treasure