In the 90s, German businesses woke up to the fact that they had the equivalent a "little India" at their back door, i.e. countries with a motivated workforce - many of whom spoke German - willing to work for cheap (except that this workforce had a higher proportion of skilled industrial trades).
Consequently, throughout the 90s German industrial companies - both large majors and SMEs - transferred a lot of their manufacturing east.
This has contributed greatly not only to stagnant incomes but to a general atmosphere of insecurity. "Ideas or the lack of them can cause disease." - Kurt Vonnegut
Think it was in the Spiegel but I don't know for sure...