To quote Hans Rosling: “The problem is, we’re rightly concerned about the world, we rightly have ideological views and emotional feelings about the world, but we need to upgrade the facts,” via http://www.forbes.com/sites/ashoka/2013/01/30/why-facts-not-...

While you may very well be right about the economy being unsustainable, a hunch just isn't enough. Especially not in cases like these.

As a general rule, watching any video with Hans Rosling as a star is a good idea.

What makes you think the Swedish economy is unsustainable?

What makes the economy of Singapore more sustainable?

Germany is #2 manufacturing exporter in the world. If they are unsustainable, I don't know what is then.

Running a perennial trade surplus is unsustainable if the country belongs to an area with fixed exchange rates, unless all the other countries also run a big trade surplus.

German exports are not contained to EU, it's a major exporter worldwide.

That doesn't matter. If the rest of EU has a trade deficit the imbalances will still accumulate. The result of that is what we are currently seeing.

There is a case to be made that the trade deficits that the world runs against Germany is unsustainable.

This is more a problem of how rest of the world is governed than how Germany is.