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residential mobility Research Methodology educational status Americas economics population demography Population Dynamics Ethnic Groups Migration, Internal ethnic group Developed Countries Salaries and Fringe Benefits Models, Economic Commerce United States North America geography health care manpower Health Manpower wage personnel management socioeconomics Western Hemisphere theoretical model Wages commercial phenomena Article Models, Theoretical migration age Geographic Factors developed country Age Factors Demographic Factors research Emigration and Immigration Economic Factors Economic Model Northern America statistical model Human Resources Macroeconomic Factors employment Labor Force