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Spain has an interesting problem right now. There is a high unemployment rate and also a large number of jobs unfilled and offering rather eyewatering salaries (tech jobs in Spain are currently offering more than tech jobs in the City of London).
The issue there is that the home population, the younger generation, is unskilled for the current marketplace. There is unemployment and there are jobs, but the Venn diagram does not show a great deal of overlap between the two and the unemployed remain out of work whilst the jobs remain unfulfilled.
Education is the single biggest thing needed across the whole of the EU, but it is really desperately needed in the places currently showing the highest unemployment rates. Jobs are there, but the jobs don't match the skills of the people in those areas who have historically plied different trades than the ones offering jobs today.
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Related to this, the free movement of labour can hurt the countries which people are leaving as those with skills and knowledge are the ones to go.
This isn't strictly an international issue though. I think there is a good chance that the migration of those who have the skills or knowledge to do well ultimately negatively impacts the culture and politics of the places they leave. Perhaps the rise of the far right in Poland, Northern England, and East Germany can all be tied to this to an extent.
Not sure anyone is going to be able to answer that unless you can qualify "these people" such that stats can be looked up.