Vocabulary:Brain drain refers to the emigration of skilled professionals to developed countries. These are some of the reasons behind such emigration:
Brain Drain
Brain Drain: Pull factors: 
Better economic prospects; Higher salary and income; Better level of living and way of life; Better research facilities; Modern educational system and better chance of advancement Prestige of foreign training;
Intellectual freedom. Better working condition and better employment opportunities; Relative political stability; Presence of a rich, scientific and cultural tradition; Attraction of urban centres; Availability of experience/supporting staff; Frequent chances of a lucky break in life; Technological gap; Allocation of substantial funds for research; Greater employment possibilities Brain Drain: Push factors: Under employment, Economic under development; Low wage/salary, Political instability; Over production and under utilization or HQM; Lack of research and other facilities; Lack of freedom; Discrimination in appointment and promotion; Poor working facilities; Lack of scientific tradition and culture; Unsuitable institution; Desire for a better urban life; Desire for higher qualification and recognition; Better career expectation; Lack of satisfactory working conditions. Low rate of economic growth; Technologically poor and importer of technology. Collocations:
Brain drain Low pay # High pay Attract attention Developed countries High technology Skilled workers Definitions:
Brain drain: the situation in which large numbers of educated and very skilled people leave their own country to live and work in another one where pay and conditions are better. (http://dictionary.cambridge.org/fr/dictionnaire/anglais/brain-drain) Physician: A person who practises medicine. Physicist: An expert in physics. Scholar: An educated person who has gained mastery in one or more disciplines. Income: Revenue. Gain: Obtain something needed or wanted. Underdeveloped: Not yet or fully developed. Skilled: Having the ability to perform a task expertly and well. Unskilled: Not having special skills or training. Tempting: Highly attractive. Prefixes:
inter: between, among examples: intercontinental; interact; interchange; intercity; intermarry... extra: outside, beyond: examples: extraterrestrial; exraodinary; extracurricular... intra: within, inside: examples: intracellular; intranet... under: less than, insufficient: examples: underpaid; underestimate; undertake... over: excessively, more than: examples: overpopulated; overheat; overwork; oversleep... super: above, over, beyond: examples: supersonic; superman; supermarket... hyper: above, over, excessive: examples: hypersensitive; hypertension; hyperactive; hyperlink... anti: against: examples: antiwar; antinuclear; antibiotic... de: remove: examples: demotivate; dehydrate; de-ice; debug... post: after: example: postwar; postgraduate... pro: for, in favour of: examples: pro-American; proabortion; prodemocracy... sub: under: examples: subtitle; submarine; subskills... ex: former: examples: ex-president; ex-wife... co: with, together: examples: co-author; coexist... bi: two, twice: examples: bilingual; bilateral; biannual... multi: many: examples: multilingual; multimedia... micro: small: examples: microwave; microscopic... macro: large: examples: macroeconomic; macroscopic... pseudo: false, not real: examples: pseudonym; pseudointellectual... mis-: wrongly, badly: examples: misbehave; misunderstand...