Introduction Factors of production differ from country to country. The difference is significant in the labor skills, availability of raw materials, climate and population density. These factors are generally immobile; hence, their differences tend to persist from country to country. Even though climate and land are immobile, other factors like capital and labor have tight restrictions in terms of their physical, legal, cultural, and social form especially when their movement is between two countries as opposed to the movement within one particular country. This hence differentiates the ability in terms of supplying goods between countries. The difference is attributed to the difference in cost of production of goods. These differences ultimately establish the solid foundation of trade. Comparative advantage on the other hand is the beneficial trade between countries, despite one country having the upper hand of producing all of its goods by use of minimum resources. This therefore brings about relative efficiency that differentiates production of goods between the two countries (Suneja, 2000, p. 172). The law of comparative advantage According to Maneschi, “the principle of comparative advantage has been named the deepest and the most beautiful result in all of economics” (Maneschi, 1998, p.1). This concept plays a crucial role in international trade despite lacking a satisfactory and common definition to define it. In the dictionary of economics, this concept has been defined as a systematic definition of gains attained from trade in reference to division of labor and specialization. It is the perception of others to define specialization effects in terms of comparative advantage as well as use theories in consideration of its sources. Overall, comparative advantage is side supplying of differences between various countries in regard to technologies as well as factor endowments. This explanation has been subjected to criticism from different quarters, with some arguing that the explanation failed to account beyond reasonable doubt, the trade pattern after World War II, in particular concerning the expansive fraction of world trade, which was tribute to growth, and the nature of intra-industry. This has partly led to the constant challenging of Hecksher-Ohlin theory over the last two decades by the new trade theory. Despite of these shortcomings, the trade models founded on comparative advantage continue to be popular in regard to international economics. The concept continues to receive praises from high-learned professionals (Maneschi, 1998, p.1). Comparative advantage is achieved by a country if it is more productive in a given commodity as compared to both other countries other products. In defining the law of comparative advantage, one can consider the scenario of a country exporting products whose production is cheaper as compared to other countries. It is easier to understand this scenario, as no complicated commodities exist. However, complications may arise especially when the scenario becomes general in terms of technology as well as a number of factors and products (Maneschi, 1998, p.2). David Ricardo: Theory of Comparative advantage The theory states that, despite a nation h