I am reluctant to reflexively identify the cause of this downturn to be immigration because the German economy is in
almost unique in the world in that it exports nearly 50% of its GNP. I suspect that much of the downturn has to do with a downturn in exports.
That is not to say that the influx of indigestible immigrants has not caused many problems, but the sale of Volkswagens or chemicals probably is not among them.
A lot of a nations GDP is determined by the building industry.
That is why they wanted to bring in the immigrants since the Caucasian population isnt expanding.
Its a false pretense the Chinese have even fallen into. The Chinese have entire cities they built with nearly nobody living in them.