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residential mobility Research Methodology Americas economics population Migrants demography Population Dynamics motivation Migration, Internal Nonmigrants Developed Countries socioeconomic status United States North America social status psychology Occupations health care manpower Health Manpower occupation Employment Status--changes Socioeconomic Factors Psychological Factors Behavior socioeconomics Western Hemisphere theoretical model Models, Theoretical Article migration developed country Demographic Factors research Emigration and Immigration Economic Factors Transients and Migrants social class Northern America Human Resources employment