Talent gain vs. brain drain
The Nigerian economic boom of the 70s and 80s fueled by the discovery of oil made Nigeria a choice destination for many including the most prominent global technology companies at that time. The Nigerian currency was stable, and of high value, the country became a lucrative destination for economic migrants. We had an influx of Indian or Ghanaian teachers and lecturers in public secondary schools and universities. Our government could afford to pay them, and they helped us build our skills base.