comparative cost theory
Answers
David Ricardo believed that the international trade is governed by the comparative cost advantage rather than the absolute cost advantage. A country will specialise in that line of production in which it has a greater relative or comparative advantage in costs than other countries and will depend upon imports from abroad of all such commodities in which it has relative cost disadvantage.
Suppose India produces computers and rice at a high cost while Japan produces both the commodities at a low cost. It does not mean that Japan will specialise in both rice and computers and India will have nothing to export. If Japan can produce rice at a relatively lesser cost than computers, it will decide to specialise in the production and export of computers and India, which has less comparative cost disadvantage in the production of rice than computers will decide to specialise in the production of rice and export it to Japan in exchange of computers.