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In the First World countries, the industrial evolution of the developing countries is observed with concern. The are considered a strong competence in the international marked and the are held responsible for the decreasing life standard in the United States and in Europe. This is the reason to consider restrictions of the commercial relations which could limit also the Third World productivity. Paul Krugman, a professor of economics at Stanford University en Palo Alto, California, is convinced that this fear doesn't have any real base. He argues, supported by a sequence of models, which present the economic relations between the First and the Third World, that the developing countries really don't influence on the life standard or the developed countries. It shouldn't be necessary to impose import retrictions which only would hinder the economic growth of the Third World nations, and therefore the hope for a decent life standard of millions of human beings who live today in conditions of absolute poverty. Agreeing completely with the author's goals, I present here a critical discussion of the respective paper. My critics are mainly directed to the model's structure. I believe that one can use more realistic structures without modifying Krugman's final final conclusions. Some suggestions are made in this sense. [ABSTRACT FROM AUTHOR]

Water Quality Index of the National Science Foundation has been deduced for the special conditions of the USA's rivers, however, it has been used for many countries of the world Weigths for variables in the Water Quality Index, was proposed in consideration of characteristics of contaminant charge, asociate with particular production process. This considerations let us to think about index validity in our especific topic conditions. In this paper we explore about this question, based in measures maked in the Cali and Meléndez rivers, in Cali -- Colombia [ABSTRACT FROM AUTHOR]