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This study uses data from 1999/2000 to 2004/05 to determine the relative efficiency of major crops (wheat, rice, sugarcane, and cotton) in Punjab (Pakistan) and their comparative advantage in international trade as measured by economic profitability and the domestic resource cost (DRC) ratio. An economic profitability analysis demonstrates that Punjab has a comparative advantage in the domestic production of wheat for self-sufficiency but not for export purposes. In basmati production, Punjab has a comparative advantage, and increasing Basmati production for export is a viable economic proposition. The nominal protection coefficient (NPC), effective protection coefficient (EPC), and DRC for Irri rice are more than 1: the given input-output relationship and export prices do not give Punjab a comparative advantage in production of Irri for export. Sugarcane growers did not receive economic prices (i.e. prices reflecting true opportunity costs) during 2001/02 and 2002/03 in an importing scenario, while in 2003/04, the NPC was 1.02, indicating positive support to sugarcane growers. The NPCs estimated under an exporting situation range from 1.33 to 1.99, indicating that the prices received by growers are higher than the export parity/economic prices. This is also an indication that sugarcane cultivation for exporting sugar is not feasible in terms of economic value. The NPCs for cotton under an importing scenario were less than 1 while under an exporting scenario were either close to or greater than 1, implying an expansion in cotton production as imports have been more expensive than domestic production.

Trade is presumed to act as a catalyst of economic growth and the growth in exports leads to increase in the incomes of factors of production, which in turn increases the demand for input for further expansion in production. The resultant pressure on domestic capacity may stimulate technological change and investment opportunities. Also increase in demand due to raising incomes of the factors of production on account of exports may spill over into other sectors of the economy. A part of such growths could also be diffused abroad through technical assistance and aid. According to Emery (1967) empirically proved that higher rates of exports growth leads to higher economic growth. Traditionally, a developing country had the choice of two alternative trade strategies for supporting industrial development, export promotion or import substitution. A consensus has emerged among many development economists that an export expansion policy by permitting resource exploitation according to comparative advantage and by allowing for utilisation and exploitation of economies of scale leads to higher growth rates of output and employment, greater technological progress and availability of foreign exchange. These in turn enable the countries with export oriented policies to attain higher rates of growth of GNP vis-à-vis countries following import substituting industrialisation [Donges and Muller-Ohlsen (1978)].