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Brain drain is a major issue for Small Island Developing States (SIDS). Econometric analysis confirms that smallness has a strong positive impact per se on emigration rates. On average, 50 percent of the high-skilled labour force in SIDS has left their country, and the brain drain exceeds 75 percent in a few cases. In this paper, we document this phenomenon and study the bi-directional links between brain drain and development. We show that these interdependencies can be the source of multiple equilibria and that small states are much more likely to be badly coordinated than other developing countries and settle in a bad equilibrium. The reason is that their elasticity of emigration to economic performance is larger. After calibration, we identify an important number of badly coordinated SIDS and quantify the economic costs of coordination failure. These costs may exceed 100 percent of the observed GDP per capita. Badly coordinated small states require appropriate development policies aimed at retaining or repatriating their high-skilled labour force.

Migration flows are shaped by a complex combination of self-selection and out-selection mechanisms. In this paper, we analyze how existing diasporas (the stock of people born in a country and living in an another one) aspect the size and human-capital structure of current migration flows. Our analysis exploits a bilateral data set on international migration by educational attainment from 195 countries to 30 OECD countries in 1990 and 2000. Based on simple micro-foundations and controlling for various determinants of migration, we find diasporas increase migration flows, lower their average educational level and lead to higher concentration of low-skill migrants. Interestingly, diasporas explain majority of the variability of migration flows and selection. This suggests that, without changing the generosity of family reunion programs, education-based selection rules are likely to have moderate impact. Our results are highly robust to the econometric techniques, accounting for the large proportion of zeros and endogeneity problems