Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte. The Institute for the Study of Labor (IZA) in Bonn is a local and virtual international research center and a place of communication between science, politics and business. IZA is an independent nonprofit organization supported by Deutsche Post Foundation. The center is associated with the University of Bonn and offers a stimulating research environment through its international network, workshops and conferences, data service, project support, research visits and doctoral program. IZA engages in (i) original and internationally competitive research in all fields of labor economics, (ii) development of policy concepts, and (iii) dissemination of research results and concepts to the interested public. Terms of use: Documents in D I S C U S S I O N P A P E R S E R I E SIZA Discussion Papers often represent preliminary work and are circulated to encourage discussion. Citation of such a paper should account for its provisional character. A revised version may be available directly from the author. Emigration first increases before decreasing with economic development. This bell-shaped relationship between emigration and development was first hypothesized by the theory of the mobility transition (Zelinsky, 1971). Although several mechanisms have been proposed to explain the upward segment of the curve (the most common being the existence of financial constraints), they have not been examined in a systematic way. In this paper, we develop a novel migration accounting methodology and use it to quantify the main drivers of the mobility transition curve. Our analysis distinguishes between migration aspirations and realization rates of college-educated and less educated individuals at the bilateral level. Between onethird and one-half of the slope of the increasing segment is due to the changing skill composition of working-age populations, and another third is due to changing network size. The microeconomic channel (including financial incentives and constraints) only accounts for one fourth of the total effect in low-income countries, and for less than one fifth in lowermiddle-income countries. Finally, our methodology sheds light on the microfoundations of migration decisions. JEL Classification:F22, O15

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Emigration …rst increases before decreasing with economic development. This bellshaped relationship between emigration and development was …rst hypothesized by the theory of the mobility transition (Zelinsky, 1971). Although several mechanisms have been proposed to explain the upward segment of the curve (the most common being the existence of …nancial constraints), they have not been examined in a systematic way. In this paper, we develop a novel migration accounting methodology and use it to quantify the main drivers of the mobility transition curve. Our analysis distinguishes between migration aspirations and realization rates of college-educated and less educated individuals at the bilateral level. Between one-third and one-half of the slope of the increasing segment is due to the changing skill composition of working-age populations, and another third is due to changing network size. The microeconomic channel (including …nancial incentives and constraints) only accounts for one fourth of the total e¤ect in low-income countries, and for less than one …fth in lower-middle-income countries. Finally, our methodology sheds light on the microfoundations of migration decisions. JEL codes: F22, O15.