Columbia subject headings:
Africa--Economic conditions--21st century.
Africa--Social conditions--21st century.
Economic development--Africa--21st century.
Harvard subject headings:
Africa, Sub-Saharan--Economic conditions--21st century.
Economic development--Africa, Sub-Saharan.
Princeton subject headings:
Africa, Sub-Saharan--Economic conditions--21st century.
Economic development--Africa, Sub-Saharan.