It is a fact that Porter (1990) never focused primarily on the factors determining the pattern of trade, yet his theory of national competitive advantage does explain why a particular country is more competitive in a particular industry. If, for example, Italy maintains competitive advantage in the production of ceramic tiles and Switzerland possesses the competitive advantage in watches, it can be interpreted that the former will export ceramic tiles and the latter will export watches and both of them will import goods in which their own industry is not competitive.
Why is this there a difference? Porter explains that there are four factors responsible for such diversity. He calls those factors the “diamond of national advantage”. The Porters diamond model includes:
- Factor conditions
- Demand conditions
- Related and supporting industries
- Firm strategy, structure and rivalry
These factors have been more or less taken into account by earlier economists. What is crucial in Porter’s national competitive advantage theory is that it is the interaction among these factors that shapes the competitive advantage.
Factor conditions show how far the factor of production in a country can be utilized successfully in a particular industry. This concept goes beyond the factor proportions theory and explains that availability of the factors of production per se is not important, rather their contribution to the creation and upgradation of product is crucial for competitive advantage. If one says that Japan possesses competitive advantage in the production of automobiles, it is not simply because Japan has easy access to iron ore, but because the country has skilled labour force for making this industry competitive.
Secondly, the demand for product must be present in the domestic market from the very beginning of production. Porter is of the view that it is not merely the size of the market that is important, but it is the intensity and sophistication of the demand that is significant for competitive advantage. If consumers are sophisticated, they will make demands for sophisticated products and that, in turn, will help the production of sophisticated products. Gradually, the country will achieve competitive advantage in such production.
Thirdly, the firm operating along with its competitors as well as its complementary firms gathers benefit through a close working relationship in form of competition or backward and forward linkages. If competition is acute, every firm will like to produce better quality goods at a lower cost in order to survive in the market. Again, if there is agglomeration of complementary units in a particular region, there may be strong backward and forward linkages. All this will help attain national competitive advantage.
Fourthly, the firm’s own strategy helps in augmenting export. There is no fixed rule regarding the adoption of a particular strategy. It depends upon a number of factors present in the home country or the importing country and it differs from time to time. Nevertheless, the strategic decisions of the firm have lasting effects on their future competitiveness. Again, equally important is the industry structure and rivalry among different companies. The greater the rivalry, the greater the competitive strength of the industry.
Besides the four factors, Porter gives weightage to a couple of factors, such as governmental policy and the role of chance of events. Governmental policy influences all the four factors through various regulatory/deregulatory measures. It can control the availability of various resources of change the pattern of demand through taxes and so on. It can encourage/discourage supportive industries through various incentives/disincentives. Similarly, chance of events, such as war or some unforeseen events like inventions/innovations; discontinuities in the supply of inputs; and so forth can eliminate the advantages possessed by competitors.
However, there are various criticisms put forth against Porter’s national competitive advantage theory. First, there are cases when the absence of any of the factors embodies in Porter’s diamond does not affect the competitive advantage. For example, when a firm is exporting its entire output, the intensity of demand at home does not matter. Secondly, if the domestic suppliers of inputs are not available, the backward linkage will be meaningless. Thirdly, Porter’s national competitive advantage theory is based on empirical findings covering 10 countries and four industries. A majority of the countries in the sample have different economic backgrounds and do not necessarily support the finding. Fourthly, availability of natural resources, according to Porter, is not the only condition for attaining competitive advantage and there must be other factors too for it. But the study of Rugman and McIlveen (1985) shows that some Canadian industries emerged on the global map only on the basis of natural resource availability. Fifthly, Porter feels that sizeable domestic demand must be present for attaining competitive advantage. But there are industries that have flourished because of demand from foreign consumers. For example, a lion’s share of Nestle’s earnings comes from foreign sales. Nevertheless, these limitations do not undermine the significance of Porter’s national competitive advantage theory.