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With this study we want to test the validity of the well known "Verdoorn'sLaw" which considers the relationship between the growth of productivity andoutput in the case of the Portuguese economy at a regional and sectoral levels(NUTs II) for the period 1995-1999. The importance of some additional variablesin the original specification of Verdoorn's Law is also tested, such as, tradeflows, capital accumulation and labour concentration. The main objective of thestudy is to confirm the presence of economies to scale that characterise thepolarisation process with cumulative causation properties, explaining regionaldivergence. By introducing new variables to the original specification ofVerdoorn's Law we intend to examine how the economies to scale are influencedby the consideration of factors related to the Polarisation (Keynensiantradition) and Agglomeration (spatial economics tradition) phenomena. Theresults obtained from the regression analysis based on panel estimation showthat the original specification of Verdoorn's Law is more robust and confirmthe presence of increasing economies to scale at both, regional and sectorallevels. However, the additional variables related to trade flows, capitalaccumulation and labour concentration have few influence on the performance ofeconomies to scale (1)(Martinho, 2011).

An Alternative Use of the Verdoorn Law at the Portuguese NUTs II Level