So not only are highly qualified staff in very short supply, but even if we invested massively today in education, it would take several years for the graduates to be available in sufficient numbers on the labor market. Attract highly qualified staff. It's a business that is going marvelously well. Many Swiss will be settling there, too. As for the Americans, they have kept complete control over management, which constitutes their national sport.
Brains attract brains.
A young researcher wants to work where the intellectual stimulation is greatest. This has nothing to do with money. American universities do not pay high salaries, but their infrastructure is first rate and, above all, they offer the possibility of meeting the best researchers in practically every domain. Perhaps there is, indeed, a little snobbery involved. But the fact is that in a university CV, the US has become an almost obligatory stage, whether in economics or science.