The main purpose of this study is to measure, among commodities and among agro-economic zones, the economic efficiency and the real cost of earning foreign exchange through producing and exporting eight selected commodities by using the concepts of social profitability and domestic resource cost. The eight selected commodities are namely: rice, sugar cane, maize, cassava root, kenaf, mung beans, ground nuts and soybeans. The interaction between economic efficiency and government intervention in the external trade of these commodities will also be examined. The period included in the study will be 1977/78, 1978/79, 1979/80 and 1980/81 crop years.