i) Today, most professional workers are required by the developed nations
as they have already attained development in the other sectors of the economy.
ii) They were characterized by industrial development as early as at the beginning of the 19th century.
iii) They require professionally qualified staff to maintain the economy and take strategic decisions. Because of the higher standard of living, better salary and other factors, professionals migrate to developed countries.
iv) Technically and professionally qualified people migrate to the developed countries. They mostly include people like doctors, engineers, and IT professionals.
v) The developed countries saw the migration of semi-skilled and unskilled workers during 1950s and 1960s when they were achieving the peak of development.