Unlike the theory of the traditional trade that assumption that the international difference explained why several countries exported the temporary agricultural product other exported industrial things. However the Paul Krugman  theory clarified why the trade was all over the world of his fact dominated by countries that only did not have the similarity of the condition, but also traded in the same product. Paul Krugman  formalized the policy of the trade in the new world that helped to explain that the global crisis tended to become a concentration, good in the term whether the basis that was made by the manufacture and where his location. His theory showed that the global crisis tended to increase the living pressure of the city community, and to make people be pushed to the center of the concentration.

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