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National debt and private debt are two very different creatures. National debt is for the most part a good thing, since it's a measure of the amount of a national currency is in circulation Modern economic theory proposes that nations, with full control over their currency, have infinite spending power (aka can go into infinite debt) without any issues, as long as full-employment hasn't been reached This is of course not entirely possible for many EU countries, since being a member of the eurozone means the country does not have full control over its currency - which was a large contributor to, for instance, the Greek financial crisis |
If anything, stuff like global currencies ($, €) bail out their respective owners because they're world reserve currencies. Some of the smaller Eurozone countries would have definitely defaulted, had hyperinflation, etc, without the Euro. Now they're in recession instead, which sucks a lot but still less than the alternative.