I've wondered about this myself, not to mention related odd situations. For example, a country can have a fully functioning domestic economy with prices in some kind of equilibrium or 'homeostasis', yet the foreign exchange rate seems ridiculously low and imports seem unjustifiably expensive. Why?
I feel that has something do to with mercantilism. Tariffs, quotas... i.e. the idea that the nation needs to be 'defended' on an international level by such measures. Very prominent in the US and the EU.
I am more interested into how that from an economical perspective makes sense
Both the EU and US are in for a shitstorm. EU already. US is almost certainly going to face a devastated dollar in the near future.
I'd recommend Asia instead... Look at China. Lots of savings. No debt culture (not to say that their policies are any better... hardly so... but not as depraved as the West. Yet.)