Columbia subject headings:
Harvard subject headings:
Africa, Sub-Saharan--Economic policy.
Africa--Economic conditions--1960---Econometric models.
Foreign trade regulation--Africa--Econometric models.
Investments--Africa--Econometric models.
Rent (Economic theory)
Rent (Economic theory)--Econometric models.
Princeton subject headings:
Africa--Economic conditions--1960---Econometric models.
Foreign trade regulation--Africa--Econometric models.
Investments--Africa--Econometric models.
Rent (Economic theory)--Econometric models.