The pace of international skilled migration has accelerated during recent decades and it has attracted considerable attention. In particular, recent data suggest that emigration of highly skilled people from developing countries is a more and more relevant phenomena. This thesis contributes to the brain drain debate and it gives particular attention to the role of diaspora externalities in inducing economic development in migrants’ originating countries. In particular: Chapter 1 gives a general and critical idea of the brain drain issue with particular attention to diaspora networks. Chapter 2 empirically evaluates the impact of the skilled diaspora abroad on the aggregate amount of FDI inflows in the countries of origin. Chapter 3 deals with diaspora externalities and technology transfer. It shows that skilled migration increases TFP growth in areas far from the technological frontier. Finally, Chapter 4 presents a CGE model of the world economy. This model combines the major results of existing theoretical and empirical literature in a general equilibrium framework of world economy and it provides a more thorough analysis regarding the total effects of skilled-biased out-migration on developing countries. It assesses the significance of several feedback effects due to migration, and in particular it considers the network effects considered in chapter 2 and 3. / L’ampleur de la migration qualifiée s'est intensifiée au cours des dernières décennies et a attiré une attention considérable. En particulier, de récentes données suggèrent que l'émigration des personnes hautement qualifiées originaires de pays en développement est un phénomène de plus en plus préoccupant. Cette thèse contribue au débat sur la fuite des cerveaux et accorde une attention particulière au rôle qu’ont les externalités de la diaspora dans le développement économique des pays d’origine des migrants. En particulier: Le chapitre 1 donne une idée générale et critique sur la fuite des cerveaux avec une attention particulière aux effets de diaspora. Le chapitre 2 évalue empiriquement l'impact de la diaspora qualifiée sur le montant global des apports d'investissements étrangers directs dans les pays d'origine. Le chapitre 3 s'intéresse aux externalités liées à la diaspora et au transfert de technologie. Il montre que la migration qualifiée augmente la croissance de la productivité globale des facteurs dans les régions loin de la frontière technologique. Enfin, le chapitre 4 présente un modèle d’équilibre général calculable de l'économie mondiale. Le modèle assemble les principaux résultats des études théoriques et empiriques dans la littérature dans le modèle d'équilibre général de l'économie mondiale, et fournit une analyse plus approfondie de l’impact de l’émigration qualifiée sur les pays en développement. Il évalue l'importance des effets secondaires de la migration, et en particulier, il tient compte des effets de réseau identifiés dans les chapitres 2 et 3.

Since the late 1980's, China has experienced the world's largest peacetime out-migration of its rural labor force to urban areas. The temporary nature of the labor migration complicates the control on this mobile population, and its multi-faceted influence on the whole economy makes the migration policy controversial. Based on cross-sectional Chinese rural household survey data, this study analyzes the effects of migration on rural areas and explores the determinants of the participation and duration of the temporary migration. The first chapter investigates how parental migration affects the decision of enrolling children in high school through migration's effects on household income and the opportunity cost of schooling in rural China. The opportunity cost of schooling is approximated by the marginal productivity of children imputed from family production estimation, which controls for potential endogeneity in the time allocation decisions of family members. The empirical results show that temporary migration of parents raises their children's probability of high school enrollment by 3.2%, resulting primarily from a positive income effect. These findings suggest that reductions in barriers to migration raise rural household earnings, and foster the investment in children's education. The second chapter studies the determinants of participation and duration of temporary rural-urban migration in China highlighting the role of education and migrant networks. The Probit and Logit models are fitted to the dichotomous migration participation estimation. To correct for the sample selection bias, Heckman's two-step procedure is used to estimate the length of migratory work. Empirical results confirm the existence of a migrant network effect on both migration participation and migration length. Schooling increases migration probability non-linearly and its effect on migration length is insignificant once migration is controlled. Furthermore, the positive effect of migrant networks on migration participation is especially prominent among individuals with junior and senior high school education. / Ph. D.

This thesis examines the roles of migrant networks in the migration and subsequent economic integration of Senegalese men and women in France, Italy and Spain. It challenges the assumption that networks are invariably sources of assistance in the migration process and examines the factors responsible for variations in their influence. In doing so, it uses quantitative methods and analyzes recently collected longitudinal data within the framework of the Migration between Africa and Europe (MAFE) project. Migrant networks -– members of the respondent’s personal circle that have international migration experience – are conceptualized as a form of individual-level social capital that may or may not shape specific outcomes. The thesis contributes to the literature by adopting a longitudinal view of the migration process and considering both migration behaviour and migrants’ labour market trajectories at destination. In doing so, it bridges two areas of research that have mostly developed separately. Second, the intersections between migrant networks and gender, insufficiently studied so far, are here examined in detail. Furthermore, the role of networks in different forms of female mobility – often confounded in previous work - are here analysed separately. Last but not least, the thesis makes a methodological contribution by operationalizing migrant networks in a more dynamic way than previous work. Findings suggest that migrant social capital has a large influence on migration behaviour, while playing a lower and more ambivalent role in migrants’ labour market outcomes at destination. Furthermore, several dimensions are found to shape the extent and channels of networks’ influence. First, men and women do not rely on the same ties in their migration process. Also, women migrating independently of a partner make a different (and greater) use of their migrant connections than those joining their spouse abroad. Migrant social capital is found to work along gender lines: only access to male migrant networks increases the migration likelihood or the job prospects at destination for prospective male migrants. On the other hand, female networks play a crucial role in independent women’s migration process. However, while they greatly increase women’s likelihood of moving to Europe on their own, they also lead them to lower-status jobs. Last, the context of destination was found to shape the operation of migrant networks. In France, where a socio-economically diverse Senegalese community has long been established, pre-migration ties at destination lead to better economic opportunities. In contrast, migrant networks in Italy or Spain appear to channel male migrants into street-selling activities. Thus, bonding social capital in the form of migrant networks appears to reproduce the ethnic niches developed at destination and the gender-segmented nature of the labour market.

Drawing on the research object of migration, mostly focused on the inclusion of asylum seekers in the European Union (EU hereinafter), this Master thesis aims at measuring the attractiveness/unattractiveness of EU countries on welcoming asylum seekers in. The method used, is then, the comparison of Portugal and Spain, two similar countries, but with quite different outcomes. Furthermore, this work suggests that external factors are on the scope of forced migration, so issues as choice on the destination country, migrant networks, previous knowledge and the integration policies make a country attractive or not. The final results bring to light the interesting findings that asylum seekers coming legally to Portugal would rather live illegal anywhere else. Moreover, even though Spain appears as a relatively more "successful" country on attracting asylum applications, it also shares the same push factors as Portugal.

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Cette thèse de doctorat étudie les effets des envois de fonds issus des migrations sur le développement des pays d’origine des migrants et compare ces effets avec ceux de l’aide publique au développement. Dans une première partie, nous étudions les effets des envois de fonds des migrants sur le développement des pays récipiendaires. Il apparaît que les envois de fonds réduisent les inégalités intra-Pays dans les pays relativement plus riches, dont les coûts d’émigration sont faibles et dont la part des émigrés qualifiés est peu importante (Chapitre 1). L’effet sur la croissance économique en Afrique sub-Saharienne est également non-Linéaire et dépend positivement du développement financier et institutionnel des pays récipiendaires (Chapitre 2). Enfin, les envois de fonds ont un effet d’appréciation sur le taux de change réel dans les pays CFA, mais cet effet est non significatif pour les pays à régime de change flexible (Chapitre 3). Dans une seconde partie nous nous intéressons au caractère stabilisateur des transferts des migrants. Le Chapitre 4 montre, au niveau microéconomique, que les envois de fonds ont joué un rôle d’assurance lors de la dernière crise financière et que ce rôle a été d’autant plus important que les migrants n’ont pas été sévèrement touchés par la crise et que les liens conservés avec le pays d’origine étaient forts. Le Chapitre 5 montre à partir d’une approche pays par pays que les transferts sont contra-Cycliques dans une minorité de cas, mais qu’en moyenne, ils répondent négativement au revenu des pays d’origine. Les résultats du Chapitre 6 indiquent que les transferts atténuent l’effet négatif des chocs commerciaux sur la pauvreté. Dans une troisième et dernière partie nous comparons les envois de fonds { l’aide publique au développement. Alors que l’aide permet d’atténuer l’effet négatif de l’instabilité des exportations sur la croissance, les transferts des migrants permettent d’amoindrir l’effet négatif de l’instabilité des exportations sur la pauvreté (Chapitre 7). Enfin, les envois de fonds diminuent la dépendance des pays { l’aide publique au développement lorsque ces flux de capitaux sont investis plutôt que consommés (Chapitre 8). / This dissertation examines the effects of migrant remittances on the development of origin countries and compares these effects with those of official development aid. In a first part we investigate the effects of remittances on the development of recipient countries. Results suggest that remittances reduce within inequality in countries more developed, where migration cost are lower and the share of skilled migrants less important (Chapter 1). Their impact on growth in sub-Saharan Africa is also non-Linear and depends positively on the financial and institutional development of recipient economies (Chapter 2). Finally, remittances have a real exchange appreciation effect in CFA countries, but not in countries with a flexible exchange rate regime (Chapter 3). In a second part we focus on the stabilizing impact of remittances. Chapter 4 shows, at the microeconomic level, that remittances have played an insurance role during the last financial crisis and that this role was all the more acute that migrants have not strongly suffered from the crisis and that family links were strong. Chapter 5 suggests in a country-By-Country approach that remittances are pro-Cyclical in a higher number of cases, while on average, they respond negatively to the home country income. Chapter 6 findings show that remittances dampen the harmful impact of trade instability on poverty. In a third part, we compare migrant remittances with public aid. While public aid mitigates the harmful impact of export instability on output growth, migrant remittances dampen the harmful effect of export instability on poverty (Chapter 7). Finally, migrant remittances reduce aid dependency in countries where remittances are invested rather than consumed (Chapter 8).