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residential mobility Research Methodology Americas economics population industry demography Migrants Population Dynamics Migration, Internal Developed Countries Salaries and Fringe Benefits Models, Economic United States income North America Occupations health care manpower Health Manpower wage occupation Socioeconomic Factors personnel management Behavior socioeconomics Western Hemisphere theoretical model Wages Models, Theoretical Article migration developed country Demographic Factors research Emigration and Immigration Economic Factors Economic Model Transients and Migrants Northern America statistical model decision making Human Resources Macroeconomic Factors Occupations--changes