Foreign aid and remittances (i.e. transfers of money by international migrants to their home country) are key sources of external resources for developing countries. In particular, remittances have been increasingly perceived as offering a vital lifeline for millions of poor households in developing countries and their levels have kept rising over the last decades.
Docquier, F., & Machado Carneiro, J. (2015). Remittance and Migration Prospects for the Twenty-First Century. In Matthieu Boussichas; Patrick Guillaumont (ed.), Financing Sustainable Development: Addressing Vulnerabilities (p. p. 217-230). Economica. https://hdl.handle.net/2078.5/184651