It's hard to know exactly what a truly integrated, multinational superentity is, though.
For example, in this case Spain did everything right. They even regulated their banks so they wouldn't make risky loans. But they couldn't stop German banks making the same loans - so does this mean that regulatory authority over banking should be seceded to the EU too?
For example, in this case Spain did everything right. They even regulated their banks so they wouldn't make risky loans. But they couldn't stop German banks making the same loans - so does this mean that regulatory authority over banking should be seceded to the EU too?