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That's because Ireland has low corporation tax (12.5%) so multinational companies export their profits there and artificially inflate the GDP.

That may change however:

"Ireland's low corporate tax level of 12.5% should be doubled to 25% as part of a common rate across Europe, a cross-party group of MEPs have said."

Agreed; isn't this why this discussion should use GNP? Or would that miss some other relevant detail?