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statistical analysis unemployment Australia economics population social policy demography Migrants Population Dynamics Developed Countries policy socioeconomic status Oceania social status health care manpower labor migration Health Manpower Socioeconomic Factors Pacific islands socioeconomics labour structure unemployment trade Article employment status immigration impact migration international migration developed country Demographic Factors Emigration and Immigration Economic Factors Transients and Migrants social class Human Resources public policy Macroeconomic Factors Demographic Impact Labor Force employment Migration Policy Population Policy