Summary             The competitiveness of the economic sectors has deserved innumerable works, studies and experiences. However, there is not an accepted definition of the term, and the number of factors that stimulate and improve it are not clearly established.             Some authors mention the previous need of a demanding and well developed domestic market, to generate the experience that allows to compete on the world market.             Even tough Argentina is the first world exporter of soybean and sunflower oils, the internal demand of this products is very low, specially of soybean oil.             In this Thesis we demonstrate that a sector of the economy with low internal demand can be competitive throughout the years and with a positive commercial balance, indicating a high degree of competitiveness.             Generally, the investments are allocated to the generation of advanced and specialized factors of competitiveness, which generates higher orders of competitiveness. However, we will demonstrate that even slightly significant investments applied to structural basic and generic factors, can intensify significantly the specialization and improve the competitiveness of an economic sector. This is a very important result, since there are many developing countries, where the economic resources are limited.             Additionally, the study of the means by which the impact of some driving factors of the competitiveness can be quantified, has generated the creation of a graphical - numerical method, based on the sum of vectors, which is very useful to compare the behavior of the competitiveness of a sector in different periods of time or among different countries.