Porter’s notesPorters notes that ‘firms, not individual nations, compete in international markets.How does this statement help to explain some of the major challenges facing MNEs .How do the determinants of national competitive advantage help explain how companies can maintain their economic competitiveness?Porters note that firms and not individual nations compete in the international market is a statement that is very valid and cannot be overemphasized. The involvement of nations in the international market is just to weigh and to justify their existence in terms of the total output in term of production from the nation. A nation with a high production rate will be rated high in terms of its GDP which is the market value of the total amount of goods and services made within the borders of that particular country in a calendar year. This makes nations to encourage firms to establish in their countries while they provide conducive environment for such firms to operate.