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Research Methodology ecology economics population methodology demography developing country ecological approach Population Dynamics global economy world system Developing Countries Agricultural Workers migration determinants world economy urban ecology migration motive Agriculture Environment economic conditions economic development health care manpower Health Manpower Behavior theoretical model Models, Theoretical Article social adaptation migration international migration Demographic Factors World research Emigration and Immigration Economic Factors International Migration--determinants Human Resources Macroeconomic Factors employment Labor Force theoretical studies Social Adjustment social behavior