The debate on brain drains and brain gain remains central to migration discussions, particularly in Nigeria and Africa. This study explored the missing link between the two by reviewing literature conceptually, theoretically, and empirically. Based in the Neo-Classical Theory of Migration, it highlights migration as a rational response to wage and opportunity gaps while emphasizing circular migration’s role in balancing labour markets and fostering development. Key push factors driving migration in Nigeria include poverty, unemployment, insecurity, poor governance, political instability, a weak education sector, corruption, and economic hardship. These factors compel skilled professionals to seek opportunities abroad, leading to brain drain and its negative impacts, such as weakened healthcare and education systems, loss of innovation, and economic stagnation. However, migrants often face challenges in host countries, including underemployment, non-recognition of qualifications, legal hurdles, and socio-economic struggles, forcing many into low-skilled jobs. This study identifies brain circulation as the crucial link between brain drain and brain gain. By facilitating knowledge, skills, and resource exchange between home and host countries, brain circulation enables contributions to development without requiring permanent return. To transform brain, drains into an opportunity for growth, Nigeria and Africa should implement strategic policies that harness brain circulation for innovation, economic progress, and sustainable development.
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