The history of economic development has demonstrated eloquently that developed countries, after a certain stage, begin to encounter manpower problems. The scarcity of manpower to work in occupations at the base of the labor pyramid deprives such countries of flexibility in their growth process. In every case, upon reaching this point--which for Germany and Switzerland, for example, was during the decade of the 70's--countries have resorted to the importation of labor either through formal programs, as in the case of the European countries, or simply by allowing in one way or another the influx of illegal workers, as in the United States. From a purely economic point of view, immigration to a country leads to a per capita income increase across the board rather than simply an increase for the owners of capital, landowners, and groups that do not compete for manpower.
Latin American and Iberian Institute
Migration, United States, Remittances
Diez-Canedo, Juan. "Undocumented Migration to the United States A New Perspective." (1981). https://digitalrepository.unm.edu/laii_research/32