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Structure of Interregional Trade and Migration Flows in Spain : Analogy or Disparity ?

The purpose of this paper is to perform an exploratory investigation of the similarity between the economic structure of interregional trade and migration flows within Spain for the years 1998 and 1999. Both variables act upon regional economic growth, but their flows rely on different driving forces. We apply SONIS’ ,1980, extreme tendency decomposition to the flow matrices. The results reveal that half of the most important trade and migration flows have the same origin and destination regions and take place mostly between neighbors. This may be due to increasing transportation and non-pecuniary costs with distance. The same conclusions hold for flow growth.