When Does Diaspora Engagement Mitigate Brain Drain? Human Capital Flight and Development in Sub‐Saharan Africa

ABSTRACT This study examines whether diaspora engagement conditions the association between human capital flight and economic and social development in 42 Sub‐Saharan African countries over 2000–2024. Using an unbalanced panel and Dynamic Common Correlated Effects Mean Group estimation, the analysis accounts for cross‐sectional dependence, slope heterogeneity, country‐specific dynamics, and common shocks. Human capital flight is negatively and significantly associated with both GDP per capita and life expectancy, confirming that skilled emigration remains an important development constraint across the region. Remittance‐based diaspora engagement moderates the relationship with economic development: higher remittance intensity substantially attenuates the adverse marginal effect of human capital flight. However, the corresponding interaction is not significant for social development, and marginal effects remain negative at substantively relevant remittance levels, providing no evidence of a general transformation from brain drain to brain circulation. Regional and income‐group estimates reveal meaningful heterogeneity, while robustness tests using an alternative human‐capital‐flight measure and outlier exclusion broadly preserve the economic attenuation result. By contrast, a diaspora‐stock measure of network depth does not reproduce the baseline moderation effect. An external shift‐share instrumental‐variable analysis confirms the negative human‐capital‐flight association for both outcomes but does not establish the moderation effect as causal. The findings therefore support a conditional attenuation framework rather than an automatic brain‐circulation narrative. Diaspora finance can mitigate some economic costs of skilled emigration, but it cannot substitute for domestic talent retention, stronger institutions, productive investment, and policies that convert transnational resources into sustainable development capabilities within origin economies over time.