There are a number of countries that will only allow people to migrate to their countries who have a high level of education / skills. e.g. Doctors, engineers and what ever skills are required at the time.
What i want to know is that do these programs that target skills specifically reduce the overall level of welfare in the source country by taking away skilled people or is there no real impact to this.
This results in people from many less developed countries moving to the more developed countries, taking the skills knowledge and possibly the people who will strive for change from that country. Or maybe I'm wrong and the people leave for a while and them come back bringing additional benefits with them and possibly sending money back while they were out of the country.
I can speculate but do not really know.