Chapter 3. Migration and the Demographic Shift This chapter investigates the two way relationship between population aging and international migration. After documenting the trends for both we review the supply push and demand pull determinants of migration focusing particularly on the role of age and aging. We subsequently analyze the implications of migration in the context of aging for labor markets as well as for health and public budgets including in the context of political economy. Although immigration is sometimes suggested as a solution for the aging problem the existing academic literature from different fields is more cautious about its role and potential. While some suggest that large scale selective immigration might contribute to alleviating demographic pressures in general researchers conclude that migration alone is not likely to play a significant role.