Population Birth control -- 3 Emigration and immigration 3 Population policy 3 Social conditions 3 Demography -- 2 Economic conditions -- 2 more ... Economic forecasting -- 2 Economic policy 2 Ethnic relations 2 Food supply 2 Population forecasting -- 2 Alien labor -- 1 Asia 1 Birth control 1 Democracy -- 1 Diet 1 Economic condition 1 Economic conditions 1 Economic development 1 Economic development -- 1 Education -- 1 Emmigration and immigration 1 Environmental aspects 1 Fertility 1 Fertility Human -- 1 Fertility, Human 1 Food supply -- 1 Health and Hygiene -- 1 Human capital -- 1 less ...