However, none of these explanations is sufficient to explain the commercial success of a country. An alternative to these rather macro economic explanations was developed by M. Porter. It consists in studying specific industrial sectors and segments of a nation instead of the overall economy. M. Porter studied what specific elements condition the international success of an enterprise in a certain segment. He figured out that the enterprises of a country must have a competitive advantage by inferior costs, or differentiated product to assert themselves worldwide (the advantage is situated in the products rather than in the external elements of a country). Thus, it would be interesting to understand the fundamental basics of what is a competitive advantage according to M. Porter, and how, through the globalisation of the economic game enterprises improve their competitive advantage. That is why, the first part of this article is devoted to the definition of the competitive advantage, and the second part explains how to integrate this concept in the global industries.